18-crown-6 profile

18-crown-6 is a macrocyclic polyether with the formula (CH2CH2O)6. It is a colorless solid that is soluble in organic solvents. 18-crown-6 is a well-known example of a crown ether. 18-crown-6 is prepared by the reaction of ethylene glycol with a base, such as sodium hydroxide. The reaction is typically carried out in a solvent, such as tetrahydrofuran or dioxane. The resulting product is then purified by distillation or recrystallization. 18-crown-6 forms stable complexes with a variety of metal cations, including alkali metal cations. The complexation of metal cations by 18-crown-6 is driven by the electrostatic interactions between the oxygen atoms of the crown ether and the metal cation. These complexes are often used as catalysts in organic reactions and as carriers for metal cations in biological systems. 18-crown-6 is also used as a phase transfer catalyst and as a sensor for metal ions. 18-crown-6 is a versatile compound that has found a wide range of applications in chemistry, biology, and materials science.'

18-crown-6 : A crown ether that is cyclooctadecane in which the carbon atoms at positions 1, 4, 7, 10, 13 and 16 have been replaced by oxygen atoms. [Chemical Entities of Biological Interest (ChEBI), Hastings J, Owen G, Dekker A, Ennis M, Kale N, Muthukrishnan V, Turner S, Swainston N, Mendes P, Steinbeck C. (2016). ChEBI in 2016: Improved services and an expanding collection of metabolites. Nucleic Acids Res]

ID Source	ID
PubMed CID	28557
CHEMBL ID	155204
CHEBI ID	32397
SCHEMBL ID	1119
MeSH ID	M0065265

Synonym
EN300-17608
3,6,9,12,15,18-hexaoxacyclooctadecan
brn 1619616
ccris 3587
1,4,7,10,13,16-hexanoxacyclooctadecane
einecs 241-473-5
nsc 159836
1,4,7,10,13,16-hexaoxacyclooctadecane
CHEBI:32397 ,
ethylene oxide cyclic hexamer
17455-13-9
1,7,10,13,16-hexaoxacyclooctadecane
nsc-159836
18-crown-6
wln: t-18-o do go jo mo potj
1,7,10,13,16-hexanoxacyclooctadecane
nsc159836
18-crown-6 ether
18-crown-6, 99%
18-crown-6, >=99.0%
18-crown 6-ether
AKOS000268988
1,4,7,10,13,16hexaoxa-cyclooctadecane
CHEMBL155204 ,
1,4,7,10,13,16-hexaoxacyclooctadecane;1,4,7,10,13,16-hexaoxacyclooctadecane (18-crown-6)
A811662
unii-63j177nc5b
63j177nc5b ,
5-19-12-00601 (beilstein handbook reference)
hexaoxacyclooctadecane
1,4,7,10,13,16-hexoxacyclooctadecane
BP-10155
FT-0607264
18-crown ether-6
SCHEMBL1119
o4b ,
1,4,7, 10,13,16-hexaoxacyclooctadecane
18-crown -6
18-crown 6
1,4,7,10,13,16-hexaoxacyclooctadecan
18crown-6
18-crown-6ether
18-crown6
18--crown-6 ether
18-crown-6-ether
1,4,7,10,13,16-hexaoxacycloocta-decane
18 -crown-6
1,4,7,10,13,16-hexaoxacyclo-octadecane
DTXSID7058626
Q-200102
crown ether 18-crown-6
AC-29207
mfcd00005113
F0001-0636
CS-D1202
18-crown-6, purum, >=99.0% (gc)
18-crown-6, pkg of 25 g
18-crown-6, for ion chromatography, >=99.0% (gc)
SY002250
1,4,7,10,13,16-hexaoxacyclooctadecane (18-crown-6)
BCP24491
Q3238432
18-crown-6 ether, 97+ percent
AMY25595
STL185678
18-c-6
[18]crown-6
bdbm50530238

Excerpt	Reference	Relevance
" The method was successfully applied to study the pharmacokinetic of PVP-I in rabbits after vaginal administration."	( Optimization and validation of an ion-pair RP-HPLC-UV method for the determination of total free iodine in rabbit plasma: application to a pharmacokinetic study. Cui, L; Fan, G; Wang, S; Wen, J; Zhou, T, 2009)	0.35

Excerpt	Relevance	Reference
" All signs faded after four days when dosage levels were kept constant, but returned when the dose was doubled."	( Behavioral and neuropharmacological toxicology of the macrocyclic ether 18-crown-6. Conroy, WJ; Gad, SC; McKelvey, JA; Turney, KA, 1978)	0.49

Role	Description
phase-transfer catalyst	A catalyst that facilitates the migration of a reactant from one phase into another phase where reaction occurs.
[role information is derived from Chemical Entities of Biological Interest (ChEBI), Hastings J, Owen G, Dekker A, Ennis M, Kale N, Muthukrishnan V, Turner S, Swainston N, Mendes P, Steinbeck C. (2016). ChEBI in 2016: Improved services and an expanding collection of metabolites. Nucleic Acids Res]

Class	Description
crown ether	Crown compounds containing only oxygen as coordinating atom.
saturated organic heteromonocyclic parent
[compound class information is derived from Chemical Entities of Biological Interest (ChEBI), Hastings J, Owen G, Dekker A, Ennis M, Kale N, Muthukrishnan V, Turner S, Swainston N, Mendes P, Steinbeck C. (2016). ChEBI in 2016: Improved services and an expanding collection of metabolites. Nucleic Acids Res]

Protein	Taxonomy	Measurement	Average	Min (ref.)	Avg (ref.)	Max (ref.)	Bioassay(s)
Transthyretin	Homo sapiens (human)	IC50 (µMol)	15.0000	0.1600	4.2921	10.0000	AID1614589; AID1614590
[prepared from compound, protein, and bioassay information from National Library of Medicine (NLM), extracted Dec-2023]

Process	via Protein(s)	Taxonomy
signal transduction	Transthyretin	Homo sapiens (human)
purine nucleobase metabolic process	Transthyretin	Homo sapiens (human)
[Information is prepared from geneontology information from the June-17-2024 release]

Process	via Protein(s)	Taxonomy
hormone activity	Transthyretin	Homo sapiens (human)
protein binding	Transthyretin	Homo sapiens (human)
identical protein binding	Transthyretin	Homo sapiens (human)
thyroid hormone binding	Transthyretin	Homo sapiens (human)
[Information is prepared from geneontology information from the June-17-2024 release]

Process	via Protein(s)	Taxonomy
extracellular region	Transthyretin	Homo sapiens (human)
extracellular space	Transthyretin	Homo sapiens (human)
azurophil granule lumen	Transthyretin	Homo sapiens (human)
extracellular exosome	Transthyretin	Homo sapiens (human)
extracellular space	Transthyretin	Homo sapiens (human)
[Information is prepared from geneontology information from the June-17-2024 release]

Assay ID	Title	Year	Journal	Article
AID280245	Antiproliferative activity against H460 cells after 72 hrs by MTT assay	2007	Journal of medicinal chemistry, Mar-08, Volume: 50, Issue:5	Antitumor potential of crown ethers: structure-activity relationships, cell cycle disturbances, and cell death studies of a series of ionophores.
AID1614585	Stabilization of TTR V30M mutant (unknown origin) expressed in Escherichia coli assessed as formation of TTR tetramer band formation at 100 mM after 4 mins by SDS-PAGE analysis based glutaraldehyde cross-linking assay	2019	Journal of medicinal chemistry, 02-28, Volume: 62, Issue:4	Crown Ethers as Transthyretin Amyloidogenesis Inhibitors.
AID1614590	Inhibition of ANS binding to TTR V30M mutant (unknown origin) expressed in Escherichia coli assessed as BC50 for ANS binding to TTR at 5 uM in presence of 150 mM K+ by fluorescence-based assay (Rvb = 3 uM)	2019	Journal of medicinal chemistry, 02-28, Volume: 62, Issue:4	Crown Ethers as Transthyretin Amyloidogenesis Inhibitors.
AID280247	Antiproliferative activity against MiaPaCa2 cells after 72 hrs by MTT assay	2007	Journal of medicinal chemistry, Mar-08, Volume: 50, Issue:5	Antitumor potential of crown ethers: structure-activity relationships, cell cycle disturbances, and cell death studies of a series of ionophores.
AID280246	Antiproliferative activity against HeLa cells after 72 hrs by MTT assay	2007	Journal of medicinal chemistry, Mar-08, Volume: 50, Issue:5	Antitumor potential of crown ethers: structure-activity relationships, cell cycle disturbances, and cell death studies of a series of ionophores.
AID1614589	Inhibition of ANS binding to TTR V30M mutant (unknown origin) expressed in Escherichia coli assessed as BC50 for ANS binding to TTR at 100 mM in presence of 150 mM Na+ by fluorescence-based assay (Rvb = 3 uM)	2019	Journal of medicinal chemistry, 02-28, Volume: 62, Issue:4	Crown Ethers as Transthyretin Amyloidogenesis Inhibitors.
AID1614579	Inhibition of TTR V30M mutant (unknown origin)-mediated amyloid fibril formation expressed in Escherichia coli assessed as amyloid fibril percentage at 6 mM after 4 days by thioflavin-T-fluorescence based assay (Rvb = 100%)	2019	Journal of medicinal chemistry, 02-28, Volume: 62, Issue:4	Crown Ethers as Transthyretin Amyloidogenesis Inhibitors.
AID280249	Antiproliferative activity against MCF7 cells after 72 hrs by MTT assay	2007	Journal of medicinal chemistry, Mar-08, Volume: 50, Issue:5	Antitumor potential of crown ethers: structure-activity relationships, cell cycle disturbances, and cell death studies of a series of ionophores.
AID280248	Antiproliferative activity against SW620 cells after 72 hrs by MTT assay	2007	Journal of medicinal chemistry, Mar-08, Volume: 50, Issue:5	Antitumor potential of crown ethers: structure-activity relationships, cell cycle disturbances, and cell death studies of a series of ionophores.
AID1614581	Inhibition of TTR V30M mutant (unknown origin)-mediated amyloid fibril formation expressed in Escherichia coli assessed as amyloid fibril percentage at 2 mM after 4 days by thioflavin-T-fluorescence based assay (Rvb = 100%)	2019	Journal of medicinal chemistry, 02-28, Volume: 62, Issue:4	Crown Ethers as Transthyretin Amyloidogenesis Inhibitors.
AID50775	In vitro lethal dose of compound against Eimeria tenella in chicken kidney cell cultures	1983	Journal of medicinal chemistry, Apr, Volume: 26, Issue:4	Anticoccidial activity of crown polyethers.
AID611986	Antibacterial activity against Bacillus subtilis after 70 mins	2011	European journal of medicinal chemistry, Aug, Volume: 46, Issue:8	Could LogP be a principal determinant of biological activity in 18-crown-6 ethers? Synthesis of biologically active adamantane-substituted diaza-crowns.
AID1614580	Inhibition of TTR V30M mutant (unknown origin)-mediated amyloid fibril formation expressed in Escherichia coli assessed as amyloid fibril percentage at 20 mM after 4 days by thioflavin-T-fluorescence based assay (Rvb = 100%)	2019	Journal of medicinal chemistry, 02-28, Volume: 62, Issue:4	Crown Ethers as Transthyretin Amyloidogenesis Inhibitors.
[information is prepared from bioassay data collected from National Library of Medicine (NLM), extracted Dec-2023]

Timeframe	Studies, This Drug (%)	All Drugs %
pre-1990	12 (6.19)	18.7374
1990's	14 (7.22)	18.2507
2000's	58 (29.90)	29.6817
2010's	92 (47.42)	24.3611
2020's	18 (9.28)	2.80
[information is prepared from research data collected from National Library of Medicine (NLM), extracted Dec-2023]

Publication Type	This drug (%)	All Drugs (%)
Trials	0 (0.00%)	5.53%
Reviews	3 (1.52%)	6.00%
Case Studies	0 (0.00%)	4.05%
Observational	0 (0.00%)	0.25%
Other	195 (98.48%)	84.16%
[information is prepared from research data collected from National Library of Medicine (NLM), extracted Dec-2023]

Substance	Relationship Strength	Studies	Classes	Roles
ammonium hydroxide azane : Saturated acyclic nitrogen hydrides having the general formula NnHn+2.	1.98	1	azane; gas molecular entity; mononuclear parent hydride	EC 3.5.1.4 (amidase) inhibitor; metabolite; mouse metabolite; neurotoxin; NMR chemical shift reference compound; nucleophilic reagent; refrigerant
bromide Bromides: Salts of hydrobromic acid, HBr, with the bromine atom in the 1- oxidation state. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)	2.08	1	halide anion; monoatomic bromine
formic acid formic acid: RN given refers to parent cpd. formic acid : The simplest carboxylic acid, containing a single carbon. Occurs naturally in various sources including the venom of bee and ant stings, and is a useful organic synthetic reagent. Principally used as a preservative and antibacterial agent in livestock feed. Induces severe metabolic acidosis and ocular injury in human subjects.	2	1	monocarboxylic acid	antibacterial agent; astringent; metabolite; protic solvent; solvent
catechol [no description available]	7.11	1	catechols	allelochemical; genotoxin; plant metabolite
methane Methane: The simplest saturated hydrocarbon. It is a colorless, flammable gas, slightly soluble in water. It is one of the chief constituents of natural gas and is formed in the decomposition of organic matter. (Grant & Hackh's Chemical Dictionary, 5th ed). methane : A one-carbon compound in which the carbon is attached by single bonds to four hydrogen atoms. It is a colourless, odourless, non-toxic but flammable gas (b.p. -161degreeC).	2.75	3	alkane; gas molecular entity; mononuclear parent hydride; one-carbon compound	bacterial metabolite; fossil fuel; greenhouse gas
chlorine chloride : A halide anion formed when chlorine picks up an electron to form an an anion.	3.55	8	halide anion; monoatomic chlorine	cofactor; Escherichia coli metabolite; human metabolite
salicylic acid Scalp: The outer covering of the calvaria. It is composed of several layers: SKIN; subcutaneous connective tissue; the occipitofrontal muscle which includes the tendinous galea aponeurotica; loose connective tissue; and the pericranium (the PERIOSTEUM of the SKULL).	2.21	1	monohydroxybenzoic acid	algal metabolite; antifungal agent; antiinfective agent; EC 1.11.1.11 (L-ascorbate peroxidase) inhibitor; keratolytic drug; plant hormone; plant metabolite
n(1)-methylnicotinamide N(1)-methylnicotinamide: RN given refers to parent cpd. 1-methylnicotinamide : A pyridinium ion comprising nicotinamide having a methyl group at the 1-position. It is a metabolite of nicotinamide which was initially considered to be biologically inactive but has emerged as an anti-thrombotic and anti-inflammatory agent.	2	1	pyridinium ion	algal metabolite; anti-inflammatory agent; human urinary metabolite; mouse metabolite; plant metabolite; Saccharomyces cerevisiae metabolite
lactic acid Lactic Acid: A normal intermediate in the fermentation (oxidation, metabolism) of sugar. The concentrated form is used internally to prevent gastrointestinal fermentation. (From Stedman, 26th ed). 2-hydroxypropanoic acid : A 2-hydroxy monocarboxylic acid that is propanoic acid in which one of the alpha-hydrogens is replaced by a hydroxy group.	2.11	1	2-hydroxy monocarboxylic acid	algal metabolite; Daphnia magna metabolite
dimethyl sulfoxide Dimethyl Sulfoxide: A highly polar organic liquid, that is used widely as a chemical solvent. Because of its ability to penetrate biological membranes, it is used as a vehicle for topical application of pharmaceuticals. It is also used to protect tissue during CRYOPRESERVATION. Dimethyl sulfoxide shows a range of pharmacological activity including analgesia and anti-inflammation.. dimethyl sulfoxide : A 2-carbon sulfoxide in which the sulfur atom has two methyl substituents.	2.06	1	sulfoxide; volatile organic compound	alkylating agent; antidote; Escherichia coli metabolite; geroprotector; MRI contrast agent; non-narcotic analgesic; polar aprotic solvent; radical scavenger
formamide formimidic acid : A carboximidic acid that is formic acid in which the carbonyl oxygen is replaced by an imino group.. primary carboxamide : A carboxamide resulting from the formal condensation of a carboxylic acid with ammonia; formula RC(=O)NH2.	3.07	1	carboximidic acid; formamides; monocarboxylic acid amide; one-carbon compound	solvent
glycine [no description available]	2.47	2	alpha-amino acid; amino acid zwitterion; proteinogenic amino acid; serine family amino acid	EC 2.1.2.1 (glycine hydroxymethyltransferase) inhibitor; fundamental metabolite; hepatoprotective agent; micronutrient; neurotransmitter; NMDA receptor agonist; nutraceutical
histamine [no description available]	7.53	2	aralkylamino compound; imidazoles	human metabolite; mouse metabolite; neurotransmitter
hydrogen Hydrogen: The first chemical element in the periodic table with atomic symbol H, and atomic number 1. Protium (atomic weight 1) is by far the most common hydrogen isotope. Hydrogen also exists as the stable isotope DEUTERIUM (atomic weight 2) and the radioactive isotope TRITIUM (atomic weight 3). Hydrogen forms into a diatomic molecule at room temperature and appears as a highly flammable colorless and odorless gas.. dihydrogen : An elemental molecule consisting of two hydrogens joined by a single bond.	2.45	2	elemental hydrogen; elemental molecule; gas molecular entity	antioxidant; electron donor; food packaging gas; fuel; human metabolite
hydroquinone [no description available]	2.11	1	benzenediol; hydroquinones	antioxidant; carcinogenic agent; cofactor; Escherichia coli metabolite; human xenobiotic metabolite; mouse metabolite; skin lightening agent
iodine Iodine: A nonmetallic element of the halogen group that is represented by the atomic symbol I, atomic number 53, and atomic weight of 126.90. It is a nutritionally essential element, especially important in thyroid hormone synthesis. In solution, it has anti-infective properties and is used topically.. diiodine : Molecule comprising two covalently bonded iodine atoms with overall zero charge..	2.05	1	diatomic iodine	nutrient
thioctic acid Thioctic Acid: An octanoic acid bridged with two sulfurs so that it is sometimes also called a pentanoic acid in some naming schemes. It is biosynthesized by cleavage of LINOLEIC ACID and is a coenzyme of oxoglutarate dehydrogenase (KETOGLUTARATE DEHYDROGENASE COMPLEX). It is used in DIETARY SUPPLEMENTS.	2.05	1	dithiolanes; heterocyclic fatty acid; thia fatty acid	fundamental metabolite; geroprotector
methanol Methanol: A colorless, flammable liquid used in the manufacture of FORMALDEHYDE and ACETIC ACID, in chemical synthesis, antifreeze, and as a solvent. Ingestion of methanol is toxic and may cause blindness.. primary alcohol : A primary alcohol is a compound in which a hydroxy group, -OH, is attached to a saturated carbon atom which has either three hydrogen atoms attached to it or only one other carbon atom and two hydrogen atoms attached to it.. methanol : The primary alcohol that is the simplest aliphatic alcohol, comprising a methyl and an alcohol group.	2.94	4	alkyl alcohol; one-carbon compound; primary alcohol; volatile organic compound	amphiprotic solvent; Escherichia coli metabolite; fuel; human metabolite; mouse metabolite; Mycoplasma genitalium metabolite
melatonin [no description available]	2.21	1	acetamides; tryptamines	anticonvulsant; central nervous system depressant; geroprotector; hormone; human metabolite; immunological adjuvant; mouse metabolite; radical scavenger
nickel Nickel: A trace element with the atomic symbol Ni, atomic number 28, and atomic weight 58.69. It is a cofactor of the enzyme UREASE.. nickel ion : A nickel atom having a net electric charge.. nickel atom : Chemical element (nickel group element atom) with atomic number 28.	2.45	2	metal allergen; nickel group element atom	epitope; micronutrient
niacinamide nicotinamide : A pyridinecarboxamide that is pyridine in which the hydrogen at position 3 is replaced by a carboxamide group.	2	1	pyridine alkaloid; pyridinecarboxamide; vitamin B3	anti-inflammatory agent; antioxidant; cofactor; EC 2.4.2.30 (NAD(+) ADP-ribosyltransferase) inhibitor; EC 3.5.1.98 (histone deacetylase) inhibitor; Escherichia coli metabolite; geroprotector; human urinary metabolite; metabolite; mouse metabolite; neuroprotective agent; Saccharomyces cerevisiae metabolite; Sir2 inhibitor
nitrates Nitrates: Inorganic or organic salts and esters of nitric acid. These compounds contain the NO3- radical.	2.76	3	monovalent inorganic anion; nitrogen oxoanion; reactive nitrogen species
nitrites Nitrites: Salts of nitrous acid or compounds containing the group NO2-. The inorganic nitrites of the type MNO2 (where M=metal) are all insoluble, except the alkali nitrites. The organic nitrites may be isomeric, but not identical with the corresponding nitro compounds. (Grant & Hackh's Chemical Dictionary, 5th ed)	2.48	2	monovalent inorganic anion; nitrogen oxoanion; reactive nitrogen species	human metabolite
nitrous oxide Nitrous Oxide: Nitrogen oxide (N2O). A colorless, odorless gas that is used as an anesthetic and analgesic. High concentrations cause a narcotic effect and may replace oxygen, causing death by asphyxia. It is also used as a food aerosol in the preparation of whipping cream.. dinitrogen oxide : A nitrogen oxide consisting of linear unsymmetrical molecules with formula N2O. While it is the most used gaseous anaesthetic in the world, its major commercial use, due to its solubility under pressure in vegetable fats combined with its non-toxicity in low concentrations, is as an aerosol spray propellant and aerating agent for canisters of 'whipped' cream.	2.41	1	gas molecular entity; nitrogen oxide	analgesic; bacterial metabolite; food packaging gas; food propellant; general anaesthetic; greenhouse gas; inhalation anaesthetic; NMDA receptor antagonist; raising agent; refrigerant; vasodilator agent
oxalic acid Oxalic Acid: A strong dicarboxylic acid occurring in many plants and vegetables. It is produced in the body by metabolism of glyoxylic acid or ascorbic acid. It is not metabolized but excreted in the urine. It is used as an analytical reagent and general reducing agent.. oxalic acid : An alpha,omega-dicarboxylic acid that is ethane substituted by carboxyl groups at positions 1 and 2.	7.01	1	alpha,omega-dicarboxylic acid	algal metabolite; human metabolite; plant metabolite
phenethylamine phenethylamine: RN given refers to parent cpd; structure in Merck Index, 9th ed, #7016. 2-phenylethylamine : A phenylethylamine having the phenyl substituent at the 2-position.	2.05	1	alkaloid; aralkylamine; phenylethylamine	Escherichia coli metabolite; human metabolite; mouse metabolite
phthalic acid phthalic acid: RN given refers to parent cpd; structure in Merck Index, 9th ed, #7178. phthalic acid : A benzenedicarboxylic acid cosisting of two carboxy groups at ortho positions.	2.02	1	benzenedicarboxylic acid	human xenobiotic metabolite
pyridine azine : An organonitrogen compound of general structure RCH=N-N=CHR or RR'C=N-N=CRR'.	1.98	1	azaarene; mancude organic heteromonocyclic parent; monocyclic heteroarene; pyridines	environmental contaminant; NMR chemical shift reference compound
thiosulfates Thiosulfates: Inorganic salts of thiosulfuric acid possessing the general formula R2S2O3.. thiosulfate(2-) : A divalent inorganic anion obtained by removal of both protons from thiosulfuric acid.	2.05	1	divalent inorganic anion; sulfur oxide; sulfur oxoanion	human metabolite
succinic acid Succinic Acid: A water-soluble, colorless crystal with an acid taste that is used as a chemical intermediate, in medicine, the manufacture of lacquers, and to make perfume esters. It is also used in foods as a sequestrant, buffer, and a neutralizing agent. (Hawley's Condensed Chemical Dictionary, 12th ed, p1099; McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed, p1851). succinic acid : An alpha,omega-dicarboxylic acid resulting from the formal oxidation of each of the terminal methyl groups of butane to the corresponding carboxy group. It is an intermediate metabolite in the citric acid cycle.	2.03	1	alpha,omega-dicarboxylic acid; C4-dicarboxylic acid	anti-ulcer drug; fundamental metabolite; micronutrient; nutraceutical; radiation protective agent
toluene methylbenzene : Any alkylbenzene that is benzene substituted with one or more methyl groups.	2.05	1	methylbenzene; toluenes; volatile organic compound	cholinergic antagonist; fuel additive; neurotoxin; non-polar solvent
trimethylamine [no description available]	2.17	1	methylamines; tertiary amine	Escherichia coli metabolite; human xenobiotic metabolite
1-anilino-8-naphthalenesulfonate 1-anilino-8-naphthalenesulfonate: RN given refers to parent cpd. 8-anilinonaphthalene-1-sulfonic acid : A naphthalenesulfonic acid that is naphthalene-1-sulfonic acid substituted by a phenylamino group at position 8.	2.76	3	aminonaphthalene; naphthalenesulfonic acid	fluorescent probe
phenytoin [no description available]	2.25	1	imidazolidine-2,4-dione	anticonvulsant; drug allergen; sodium channel blocker; teratogenic agent
aspirin Aspirin: The prototypical analgesic used in the treatment of mild to moderate pain. It has anti-inflammatory and antipyretic properties and acts as an inhibitor of cyclooxygenase which results in the inhibition of the biosynthesis of prostaglandins. Aspirin also inhibits platelet aggregation and is used in the prevention of arterial and venous thrombosis. (From Martindale, The Extra Pharmacopoeia, 30th ed, p5). acetylsalicylate : A benzoate that is the conjugate base of acetylsalicylic acid, arising from deprotonation of the carboxy group.. acetylsalicylic acid : A member of the class of benzoic acids that is salicylic acid in which the hydrogen that is attached to the phenolic hydroxy group has been replaced by an acetoxy group. A non-steroidal anti-inflammatory drug with cyclooxygenase inhibitor activity.	2.05	1	benzoic acids; phenyl acetates; salicylates	anticoagulant; antipyretic; cyclooxygenase 1 inhibitor; cyclooxygenase 2 inhibitor; drug allergen; EC 1.1.1.188 (prostaglandin-F synthase) inhibitor; geroprotector; non-narcotic analgesic; non-steroidal anti-inflammatory drug; plant activator; platelet aggregation inhibitor; prostaglandin antagonist; teratogenic agent
aurintricarboxylic acid Aurintricarboxylic Acid: A dye which inhibits protein biosynthesis at the initial stages. The ammonium salt (aluminon) is a reagent for the colorimetric estimation of aluminum in water, foods, and tissues.. aurintricarboxylic acid : A member of the class of quinomethanes that is 3-methylidene-6-oxocyclohexa-1,4-diene-1-carboxylic acid in which the methylidene hydrogens are replaced by 4-carboxy-3-hydroxyphenyl groups. The trisodium salt is the biological stain 'chrome violet CG' while the triammonium salt is 'aluminon'.	2.07	1	monohydroxybenzoic acid; quinomethanes; tricarboxylic acid	fluorochrome; histological dye; insulin-like growth factor receptor 1 antagonist
deferoxamine Deferoxamine: Natural product isolated from Streptomyces pilosus. It forms iron complexes and is used as a chelating agent, particularly in the mesylate form.. desferrioxamine B : An acyclic desferrioxamine that is butanedioic acid in which one of the carboxy groups undergoes formal condensation with the primary amino group of N-(5-aminopentyl)-N-hydroxyacetamide and the second carboxy group undergoes formal condensation with the hydroxyamino group of N(1)-(5-aminopentyl)-N(1)-hydroxy-N(4)-[5-(hydroxyamino)pentyl]butanediamide. It is a siderophore native to Streptomyces pilosus biosynthesised by the DesABCD enzyme cluster as a high affinity Fe(III) chelator.	2.01	1	acyclic desferrioxamine	bacterial metabolite; ferroptosis inhibitor; iron chelator; siderophore
diflunisal Diflunisal: A salicylate derivative and anti-inflammatory analgesic with actions and side effects similar to those of ASPIRIN.. diflunisal : An organofluorine compound comprising salicylic acid having a 2,4-difluorophenyl group at the 5-position.	2.21	1	monohydroxybenzoic acid; organofluorine compound	non-narcotic analgesic; non-steroidal anti-inflammatory drug
etanidazole Etanidazole: A nitroimidazole that sensitizes hypoxic tumor cells that are normally resistant to radiation therapy.. etanidazole : A monocarboxylic acid amide obtained by formal condensation of the carboxy group of (2-nitro-1H-imidazol-1-yl)acetic acid with the amino group of ethanolamine. Used as a radiosensitising agent for hypoxic tumour cells.	2	1	C-nitro compound; imidazoles; monocarboxylic acid amide	alkylating agent; antineoplastic agent; prodrug; radiosensitizing agent
ether Ether: A mobile, very volatile, highly flammable liquid used as an inhalation anesthetic and as a solvent for waxes, fats, oils, perfumes, alkaloids, and gums. It is mildly irritating to skin and mucous membranes.. ether : An organooxygen compound with formula ROR, where R is not hydrogen.. diethyl ether : An ether in which the oxygen atom is linked to two ethyl groups.	2.76	3	ether; volatile organic compound	inhalation anaesthetic; non-polar solvent; refrigerant
fluorouracil Fluorouracil: A pyrimidine analog that is an antineoplastic antimetabolite. It interferes with DNA synthesis by blocking the THYMIDYLATE SYNTHETASE conversion of deoxyuridylic acid to thymidylic acid.. 5-fluorouracil : A nucleobase analogue that is uracil in which the hydrogen at position 5 is replaced by fluorine. It is an antineoplastic agent which acts as an antimetabolite - following conversion to the active deoxynucleotide, it inhibits DNA synthesis (by blocking the conversion of deoxyuridylic acid to thymidylic acid by the cellular enzyme thymidylate synthetase) and so slows tumour growth.	1.96	1	nucleobase analogue; organofluorine compound	antimetabolite; antineoplastic agent; environmental contaminant; immunosuppressive agent; radiosensitizing agent; xenobiotic
guanidine Guanidine: A strong organic base existing primarily as guanidium ions at physiological pH. It is found in the urine as a normal product of protein metabolism. It is also used in laboratory research as a protein denaturant. (From Martindale, the Extra Pharmacopoeia, 30th ed and Merck Index, 12th ed) It is also used in the treatment of myasthenia and as a fluorescent probe in HPLC.. guanidine : An aminocarboxamidine, the parent compound of the guanidines.	2.58	2	carboxamidine; guanidines; one-carbon compound
losartan Losartan: An antagonist of ANGIOTENSIN TYPE 1 RECEPTOR with antihypertensive activity due to the reduced pressor effect of ANGIOTENSIN II.. losartan : A biphenylyltetrazole where a 1,1'-biphenyl group is attached at the 5-position and has an additional trisubstituted imidazol-1-ylmethyl group at the 4'-position	2	1	biphenylyltetrazole; imidazoles	angiotensin receptor antagonist; anti-arrhythmia drug; antihypertensive agent; endothelin receptor antagonist
mesalamine Mesalamine: An anti-inflammatory agent, structurally related to the SALICYLATES, which is active in INFLAMMATORY BOWEL DISEASE. It is considered to be the active moiety of SULPHASALAZINE. (From Martindale, The Extra Pharmacopoeia, 30th ed). mesalamine : A monohydroxybenzoic acid that is salicylic acid substituted by an amino group at the 5-position.	2.11	1	amino acid; aromatic amine; monocarboxylic acid; monohydroxybenzoic acid; phenols	non-steroidal anti-inflammatory drug
1,2-cyclohexanediamine 1,2-cyclohexanediamine: RN given refers to cpd without isomeric designation	2.03	1	primary aliphatic amine
benoxinate benoxinate: RN given refers to parent cpd; structure. oxybuprocaine : A benzoate ester in which 4-amino-3-butoxybenzoic acid and 2-(diethylamino)ethanol have combined to form the ester bond; an ester-based local anaesthetic (ester "caine") used especially in ophthalmology and otolaryngology.	2.25	1	amino acid ester; benzoate ester; substituted aniline; tertiary amino compound	drug allergen; local anaesthetic; topical anaesthetic
quinone benzoquinone : The simplest members of the class of benzoquinones, consisting of cyclohexadiene which is substituted by two oxo groups.. 1,4-benzoquinone : The simplest member of the class of 1,4-benzoquinones, obtained by the formal oxidation of hydroquinone to the corresponding diketone. It is a metabolite of benzene.. quinone : Compounds having a fully conjugated cyclic dione structure, such as that of benzoquinones, derived from aromatic compounds by conversion of an even number of -CH= groups into -C(=O)- groups with any necessary rearrangement of double bonds (polycyclic and heterocyclic analogues are included).	2.11	1	1,4-benzoquinones	cofactor; human xenobiotic metabolite; mouse metabolite
potassium chloride Potassium Chloride: A white crystal or crystalline powder used in BUFFERS; FERTILIZERS; and EXPLOSIVES. It can be used to replenish ELECTROLYTES and restore WATER-ELECTROLYTE BALANCE in treating HYPOKALEMIA.. potassium chloride : A metal chloride salt with a K(+) counterion.	2.7	3	inorganic chloride; inorganic potassium salt; potassium salt	fertilizer
primaquine Primaquine: An aminoquinoline that is given by mouth to produce a radical cure and prevent relapse of vivax and ovale malarias following treatment with a blood schizontocide. It has also been used to prevent transmission of falciparum malaria by those returning to areas where there is a potential for re-introduction of malaria. Adverse effects include anemias and GI disturbances. (From Martindale, The Extra Pharmacopeia, 30th ed, p404). primaquine : An N-substituted diamine that is pentane-1,4-diamine substituted by a 6-methoxyquinolin-8-yl group at the N(4) position. It is a drug used in the treatment of malaria and Pneumocystis pneumonia.	7.46	2	aminoquinoline; aromatic ether; N-substituted diamine	antimalarial
procaine Procaine: A local anesthetic of the ester type that has a slow onset and a short duration of action. It is mainly used for infiltration anesthesia, peripheral nerve block, and spinal block. (From Martindale, The Extra Pharmacopoeia, 30th ed, p1016).. procaine : A benzoate ester, formally the result of esterification of 4-aminobenzoic acid with 2-diethylaminoethanol but formed experimentally by reaction of ethyl 4-aminobenzoate with 2-diethylaminoethanol.	2.25	1	benzoate ester; substituted aniline; tertiary amino compound	central nervous system depressant; drug allergen; local anaesthetic; peripheral nervous system drug
stearic acid octadecanoic acid : A C18 straight-chain saturated fatty acid component of many animal and vegetable lipids. As well as in the diet, it is used in hardening soaps, softening plastics and in making cosmetics, candles and plastics.	2.05	1	long-chain fatty acid; saturated fatty acid; straight-chain saturated fatty acid	algal metabolite; Daphnia magna metabolite; human metabolite; plant metabolite
sulfamonomethoxine Sulfamonomethoxine: Long acting sulfonamide antibacterial agent.	7.36	2	benzenes; sulfonamide
trientine Trientine: An ethylenediamine derivative used as stabilizer for EPOXY RESINS, as ampholyte for ISOELECTRIC FOCUSING and as chelating agent for copper in HEPATOLENTICULAR DEGENERATION.. TETA : An azamacrocyle in which four nitrogen atoms at positions 1, 4, 8 and 11 of a fouteen-membered ring are each substituted with a carboxymethyl group.. 2,2,2-tetramine : A polyazaalkane that is decane in which the carbon atoms at positions 1, 4, 7 and 10 are replaced by nitrogens.	2.05	1	polyazaalkane; tetramine	copper chelator
tyramine [no description available]	7.01	1	monoamine molecular messenger; primary amino compound; tyramines	EC 3.1.1.8 (cholinesterase) inhibitor; Escherichia coli metabolite; human metabolite; mouse metabolite; neurotransmitter
alanine Alanine: A non-essential amino acid that occurs in high levels in its free state in plasma. It is produced from pyruvate by transamination. It is involved in sugar and acid metabolism, increases IMMUNITY, and provides energy for muscle tissue, BRAIN, and the CENTRAL NERVOUS SYSTEM.. alanine : An alpha-amino acid that consists of propionic acid bearing an amino substituent at position 2.	7.06	1	alanine zwitterion; alanine; L-alpha-amino acid; proteinogenic amino acid; pyruvate family amino acid	EC 4.3.1.15 (diaminopropionate ammonia-lyase) inhibitor; fundamental metabolite
lysine Lysine: An essential amino acid. It is often added to animal feed.. lysine : A diamino acid that is caproic (hexanoic) acid bearing two amino substituents at positions 2 and 6.. L-lysine : An L-alpha-amino acid; the L-isomer of lysine.	8.32	6	aspartate family amino acid; L-alpha-amino acid zwitterion; L-alpha-amino acid; lysine; organic molecular entity; proteinogenic amino acid	algal metabolite; anticonvulsant; Escherichia coli metabolite; human metabolite; micronutrient; mouse metabolite; nutraceutical; plant metabolite; Saccharomyces cerevisiae metabolite
sucrose Saccharum: A plant genus of the family POACEAE widely cultivated in the tropics for the sweet cane that is processed into sugar.	2.15	1	glycosyl glycoside	algal metabolite; Escherichia coli metabolite; human metabolite; mouse metabolite; osmolyte; Saccharomyces cerevisiae metabolite; sweetening agent
tyrosine Tyrosine: A non-essential amino acid. In animals it is synthesized from PHENYLALANINE. It is also the precursor of EPINEPHRINE; THYROID HORMONES; and melanin.. tyrosine : An alpha-amino acid that is phenylalanine bearing a hydroxy substituent at position 4 on the phenyl ring.	2.8	3	amino acid zwitterion; erythrose 4-phosphate/phosphoenolpyruvate family amino acid; L-alpha-amino acid; proteinogenic amino acid; tyrosine	EC 1.3.1.43 (arogenate dehydrogenase) inhibitor; fundamental metabolite; micronutrient; nutraceutical
aniline [no description available]	2.31	1	anilines; primary arylamine
cytidine monophosphate Cytidine Monophosphate: Cytidine (dihydrogen phosphate). A cytosine nucleotide containing one phosphate group esterified to the sugar moiety in the 2', 3' or 5' position.. cytidine 5'-monophosphate : A pyrimidine ribonucleoside 5'-monophosphate having cytosine as the nucleobase.	2.47	2	cytidine 5'-phosphate; pyrimidine ribonucleoside 5'-monophosphate	Escherichia coli metabolite; human metabolite; mouse metabolite
methionine Methionine: A sulfur-containing essential L-amino acid that is important in many body functions.. methionine : A sulfur-containing amino acid that is butyric acid bearing an amino substituent at position 2 and a methylthio substituent at position 4.	2.1	1	aspartate family amino acid; L-alpha-amino acid; methionine zwitterion; methionine; proteinogenic amino acid	antidote to paracetamol poisoning; human metabolite; micronutrient; mouse metabolite; nutraceutical
phenylalanine Phenylalanine: An essential aromatic amino acid that is a precursor of MELANIN; DOPAMINE; noradrenalin (NOREPINEPHRINE), and THYROXINE.. L-phenylalanine : The L-enantiomer of phenylalanine.. phenylalanine : An aromatic amino acid that is alanine in which one of the methyl hydrogens is substituted by a phenyl group.	2.87	3	amino acid zwitterion; erythrose 4-phosphate/phosphoenolpyruvate family amino acid; L-alpha-amino acid; phenylalanine; proteinogenic amino acid	algal metabolite; EC 3.1.3.1 (alkaline phosphatase) inhibitor; Escherichia coli metabolite; human xenobiotic metabolite; micronutrient; mouse metabolite; nutraceutical; plant metabolite; Saccharomyces cerevisiae metabolite
cytidine [no description available]	2.13	1	cytidines	Escherichia coli metabolite; human metabolite; mouse metabolite; Saccharomyces cerevisiae metabolite
chloroform Chloroform: A commonly used laboratory solvent. It was previously used as an anesthetic, but was banned from use in the U.S. due to its suspected carcinogenicity.. chloroform : A one-carbon compound that is methane in which three of the hydrogens are replaced by chlorines.	2.71	3	chloromethanes; one-carbon compound	carcinogenic agent; central nervous system drug; inhalation anaesthetic; non-polar solvent; refrigerant
dimethylformamide Dimethylformamide: A formamide in which the amino hydrogens are replaced by methyl groups.. N,N-dimethylformamide : A member of the class of formamides that is formamide in which the amino hydrogens are replaced by methyl groups.	1.97	1	formamides; volatile organic compound	geroprotector; hepatotoxic agent; polar aprotic solvent
ornithine Ornithine: An amino acid produced in the urea cycle by the splitting off of urea from arginine.. ornithine : An alpha-amino acid that is pentanoic acid bearing two amino substituents at positions 2 and 5.	2.08	1	non-proteinogenic L-alpha-amino acid; ornithine	algal metabolite; hepatoprotective agent; mouse metabolite
tryptophan Tryptophan: An essential amino acid that is necessary for normal growth in infants and for NITROGEN balance in adults. It is a precursor of INDOLE ALKALOIDS in plants. It is a precursor of SEROTONIN (hence its use as an antidepressant and sleep aid). It can be a precursor to NIACIN, albeit inefficiently, in mammals.. tryptophan : An alpha-amino acid that is alanine bearing an indol-3-yl substituent at position 3.	8.02	4	erythrose 4-phosphate/phosphoenolpyruvate family amino acid; L-alpha-amino acid zwitterion; L-alpha-amino acid; proteinogenic amino acid; tryptophan zwitterion; tryptophan	antidepressant; Escherichia coli metabolite; human metabolite; micronutrient; mouse metabolite; nutraceutical; plant metabolite; Saccharomyces cerevisiae metabolite
n,n'-diphenyl-4-phenylenediamine N,N'-diphenyl-4-phenylenediamine: in veterinary medicine, has been used to prevent vitamin E deficiency in lambs; structure. N,N'-diphenyl-1,4-phenylenediamine : An N-substituted diamine that is 1,4-phenylenediamine in which one hydrogen from each amino group is replaced by a phenyl group.	2.07	1	N-substituted diamine; secondary amino compound	antioxidant
arginine Arginine: An essential amino acid that is physiologically active in the L-form.. arginine : An alpha-amino acid that is glycine in which the alpha-is substituted by a 3-guanidinopropyl group.	7.17	1	arginine; glutamine family amino acid; L-alpha-amino acid; proteinogenic amino acid	biomarker; Escherichia coli metabolite; micronutrient; mouse metabolite; nutraceutical
methylamine methyl group : An alkyl group that is the univalent group derived from methane by removal of a hydrogen atom.	1.99	1	methylamines; one-carbon compound; primary aliphatic amine	mouse metabolite
acetonitrile acetonitrile: RN given refers to unlabeled cpd. acetonitrile : A nitrile that is hydrogen cyanide in which the hydrogen has been replaced by a methyl group.	8.45	7	aliphatic nitrile; volatile organic compound	EC 3.5.1.4 (amidase) inhibitor; NMR chemical shift reference compound; polar aprotic solvent
phosgene Phosgene: A highly toxic gas that has been used as a chemical warfare agent. It is an insidious poison as it is not irritating immediately, even when fatal concentrations are inhaled. (From The Merck Index, 11th ed, p7304). phosgene : An acyl chloride obtained by substitution of both hydrogens of formaldehyde by chlorine.. chloroketone : A ketone containing a chloro substituent.	7.41	1	acyl chloride
methanesulfonic acid [no description available]	7.6	1	alkanesulfonic acid; one-carbon compound	Escherichia coli metabolite
n-methylacetamide N-methylacetamide: RN given refers to parent cpd. N-methylacetamide : A monocarboxylic acid amide that is the N-methyl derivative of acetamide.	1.99	1	acetamides; monocarboxylic acid amide	metabolite
picric acid picric acid: used as antiseptic, astringent & stimulant for epitheliazation; structure. picric acid : A C-nitro compound comprising phenol having three nitro substtituents at the 2-, 4- and 6-positions.	2.98	4	C-nitro compound	antiseptic drug; explosive; fixative
sulfosalicylic acid 5-sulfosalicylic acid : An arenesulfonic acid that is benzoic acid substituted by a hydroxy at position C-2 and a sulfo group at C-5.	2.08	1	arenesulfonic acid; benzoic acids; phenols	metabolite
p-tert-butyl catechol [no description available]	2.03	1
3-nitroaniline 3-nitroaniline: used as a sole source of nitrogen , carbon and energy	7.05	1
phenyl ether diphenyl ether : An aromatic ether in which the oxygen is attached to two phenyl substituents. It has been found in muscat grapes and vanilla.	2.04	1	aromatic ether	plant metabolite
cyclohexanol Cyclohexanols: Monohydroxy derivatives of cyclohexanes that contain the general formula R-C6H11O. They have a camphorlike odor and are used in making soaps, insecticides, germicides, dry cleaning, and plasticizers.. cyclohexanols : An alcohol in which one or more hydroxy groups are attached to a cyclohexane skeleton.	2.02	1	cyclohexanols; secondary alcohol	solvent
dicyanmethane malononitrile : A dinitrile that is methane substituted by two cyano groups.	2.02	1	aliphatic nitrile; dinitrile
pyrroles 1H-pyrrole : A tautomer of pyrrole that has the double bonds at positions 2 and 4.. pyrrole : A five-membered monocyclic heteroarene comprising one NH and four CH units which forms the parent compound of the pyrrole group of compounds. Its five-membered ring structure has three tautomers. A 'closed class'.. azole : Any monocyclic heteroarene consisting of a five-membered ring containing nitrogen. Azoles can also contain one or more other non-carbon atoms, such as nitrogen, sulfur or oxygen.	2.15	1	pyrrole; secondary amine
thiophenes Thiophenes: A monocyclic heteroarene furan in which the oxygen atom is replaced by a sulfur.. thiophenes : Compounds containing at least one thiophene ring.	2.46	2	mancude organic heteromonocyclic parent; monocyclic heteroarene; thiophenes; volatile organic compound	non-polar solvent
octylamine octylamine: RN given refers to 1-octylamine. octan-1-amine : An 8-carbon primary aliphatic amine.	2.05	1	primary aliphatic amine	metabolite
anthracene acene : A polycyclic aromatic hydrocarbon consisting of fused benzene rings in a rectilinear arrangement.. acenes : Polycyclic aromatic hydrocarbons consisting of fused benzene rings in a rectilinear arrangement and their substitution derivatives.	2.04	1	acene; anthracenes; ortho-fused tricyclic hydrocarbon
triethylamine [no description available]	2.17	1	tertiary amine
triphenylene triphenylene: structure. triphenylene : An ortho-fused polycyclic arene consisting of four fused benzene rings.	2.05	1	ortho-fused polycyclic arene
acridines Acridines: Compounds that include the structure of acridine.. acridine : A polycyclic heteroarene that is anthracene in which one of the central CH groups is replaced by a nitrogen atom.	2.06	1	acridines; mancude organic heterotricyclic parent; polycyclic heteroarene	genotoxin
adamantane Adamantane: A tricyclo bridged hydrocarbon.	7.06	1	adamantanes; polycyclic alkane
isoxazoles Isoxazoles: Azoles with an OXYGEN and a NITROGEN next to each other at the 1,2 positions, in contrast to OXAZOLES that have nitrogens at the 1,3 positions.. isoxazole : A monocyclic heteroarene with a structure consisting of a 5-membered ring containing three carbon atoms and an oxygen and nitrogen atom adjacent to each other. It is the parent of the class of isoxazoles.. isoxazoles : Oxazoles in which the N and O atoms are adjacent.	2	1	isoxazoles; mancude organic heteromonocyclic parent; monocyclic heteroarene
12-crown-4 12-crown-4: structure in first source. 12-crown-4 : A crown ether that is cyclododecane in which the carbon atoms at positions 1, 4, 7 and 10 have been replaced by oxygen atoms.	8.11	4	crown ether; saturated organic heteromonocyclic parent
cesium carbonate [no description available]	2.11	1
malondialdehyde Malondialdehyde: The dialdehyde of malonic acid.. malonaldehyde : A dialdehyde that is propane substituted by two oxo groups at the terminal carbon atoms respectively. A biomarker of oxidative damage to lipids caused by smoking, it exists in vivo mainly in the enol form.	2.03	1	dialdehyde	biomarker
glycylglycine [no description available]	2.01	1	dipeptide zwitterion; dipeptide	human metabolite
2-benzoquinone 2-benzoquinone: reacts with methionines of RNAase at pH 1; reagent for determining conformational differences in related proteins. 1,2-benzoquinone : A benzoquinone resulting from the formal oxidation of catechol.	2.06	1	1,2-benzoquinones; benzoquinone
dansyl chloride dansyl chloride: RN given refers to unlabeled cpd	2.05	1	aminonaphthalene; sulfonic acid derivative
deoxycytidine [no description available]	2.21	1	pyrimidine 2'-deoxyribonucleoside	Escherichia coli metabolite; human metabolite; mouse metabolite; Saccharomyces cerevisiae metabolite
2,6-dichloroindophenol 2,6-Dichloroindophenol: A dye used as a reagent in the determination of vitamin C.. 2,6-dichloroindophenol : A quinone imine that is indophenol substituted by chloro groups at positions 2 and 6.. N-3,5-dichloro-4-hydroxyphenyl-1,4-benzoquinone imine : 1,4-benzoquinone imine having a 3,5-dichloro-4-hydroxyphenyl substituent attached to the nitrogen atom.	2.1	1	dichlorobenzene; quinone imine
d-alpha tocopherol Vitamin E: A generic descriptor for all TOCOPHEROLS and TOCOTRIENOLS that exhibit ALPHA-TOCOPHEROL activity. By virtue of the phenolic hydrogen on the 2H-1-benzopyran-6-ol nucleus, these compounds exhibit varying degree of antioxidant activity, depending on the site and number of methyl groups and the type of ISOPRENOIDS.. tocopherol : A collective name for a group of closely related lipids that contain a chroman-6-ol nucleus substituted at position 2 by a methyl group and by a saturated hydrocarbon chain consisting of three isoprenoid units. They are designated as alpha-, beta-, gamma-, and delta-tocopherol depending on the number and position of additional methyl substituents on the aromatic ring. Tocopherols occur in vegetable oils and vegetable oil products, almost exclusively with R,R,R configuration. Tocotrienols differ from tocopherols only in having three double bonds in the hydrocarbon chain.. vitamin E : Any member of a group of fat-soluble chromanols that exhibit biological activity against vitamin E deficiency. The vitamers in this class consists of a chroman-6-ol core which is substituted at position 2 by a methyl group and (also at position 2) either a saturated or a triply-unsaturated hydrocarbon chain consisting of three isoprenoid units. The major function of vitamin E is to act as a natural antioxidant by scavenging free radicals and molecular oxygen.. (R,R,R)-alpha-tocopherol : An alpha-tocopherol that has R,R,R configuration. The naturally occurring stereoisomer of alpha-tocopherol, it is found particularly in sunflower and olive oils.	2.46	2	alpha-tocopherol	algal metabolite; antiatherogenic agent; anticoagulant; antioxidant; antiviral agent; EC 2.7.11.13 (protein kinase C) inhibitor; immunomodulator; micronutrient; nutraceutical; plant metabolite
n-isopropylacrylamide N-isopropylacrylamide: can polymerize with glycidyl acrylate to form reactive water-soluble polymer that can react with the amino groups of enzymes-proteins or other ligands	2.08	1
carbonates Carbonates: Salts or ions of the theoretical carbonic acid, containing the radical CO2(3-). Carbonates are readily decomposed by acids. The carbonates of the alkali metals are water-soluble; all others are insoluble. (From Grant & Hackh's Chemical Dictionary, 5th ed). carbonates : Organooxygen compounds that are salts or esters of carbonic acid, H2CO3.	2.11	1	carbon oxoanion
lanthanum [no description available]	2.02	1	f-block element atom; lanthanoid atom; scandium group element atom
mercury Mercury: A silver metallic element that exists as a liquid at room temperature. It has the atomic symbol Hg (from hydrargyrum, liquid silver), atomic number 80, and atomic weight 200.59. Mercury is used in many industrial applications and its salts have been employed therapeutically as purgatives, antisyphilitics, disinfectants, and astringents. It can be absorbed through the skin and mucous membranes which leads to MERCURY POISONING. Because of its toxicity, the clinical use of mercury and mercurials is diminishing.. mercury(0) : Elemental mercury of oxidation state zero.	7.05	1	elemental mercury; zinc group element atom	neurotoxin
palladium Palladium: A chemical element having an atomic weight of 106.4, atomic number of 46, and the symbol Pd. It is a white, ductile metal resembling platinum, and following it in abundance and importance of applications. It is used in dentistry in the form of gold, silver, and copper alloys.. palladium : Chemical element (nickel group element atom) with atomic number 46.	2.06	1	metal allergen; nickel group element atom; platinum group metal atom
platinum Platinum: A heavy, soft, whitish metal, resembling tin, with atomic number 78, atomic weight 195.084, symbol Pt. It is used in manufacturing equipment for laboratory and industrial use. It occurs as a black powder (platinum black) and as a spongy substance (spongy platinum) and may have been known in Pliny's time as alutiae.	2.05	1	elemental platinum; nickel group element atom; platinum group metal atom
samarium Samarium: An element of the rare earth family of metals. It has the atomic symbol Sm, atomic number 62, and atomic weight 150.36. The oxide is used in the control rods of some nuclear reactors.	2.15	1	f-block element atom; lanthanoid atom
terbium Terbium: An element of the rare earth family of metals. It has the atomic symbol Tb, atomic number 65, and atomic weight 158.92.	2.15	1	f-block element atom; lanthanoid atom
cadmium Cadmium: An element with atomic symbol Cd, atomic number 48, and atomic weight 112.41. It is a metal and ingestion will lead to CADMIUM POISONING.. elemental cadmium : An element in the zinc group of the periodic table with atomic number 48, atomic mass 112, M.P. 321degreeC, and B.P. 765degreeC). An odourless, tasteless, and highly poisonous soft, ductile, lustrous metal with electropositive properties. It has eight stable isotopes: (106)Cd, (108)Cd,(110)Cd, (111)Cd, (112)Cd, (113)Cd, (114)Cd and (116)Cd, with (112)Cd and (114)Cd being the most common.	2.48	2	cadmium molecular entity; zinc group element atom
europium Europium: An element of the rare earth family of metals. It has the atomic symbol Eu, atomic number 63, and atomic weight 152. Europium is used in the form of its salts as coatings for cathode ray tubes and in the form of its organic derivatives as shift reagents in NMR spectroscopy.	2.46	2	f-block element atom; lanthanoid atom
gold Gold: A yellow metallic element with the atomic symbol Au, atomic number 79, and atomic weight 197. It is used in jewelry, goldplating of other metals, as currency, and in dental restoration. Many of its clinical applications, such as ANTIRHEUMATIC AGENTS, are in the form of its salts.	8.18	5	copper group element atom; elemental gold
helium Helium: A noble gas with the atomic symbol He, atomic number 2, and atomic weight 4.003. It is a colorless, odorless, tasteless gas that is not combustible and does not support combustion. It was first detected in the sun and is now obtained from natural gas. Medically it is used as a diluent for other gases, being especially useful with oxygen in the treatment of certain cases of respiratory obstruction, and as a vehicle for general anesthetics.	7.11	1	monoatomic helium; noble gas atom; s-block element atom	food packaging gas
vanadium Vanadium: A metallic element with the atomic symbol V, atomic number 23, and atomic weight 50.94. It is used in the manufacture of vanadium steel. Prolonged exposure can lead to chronic intoxication caused by absorption usually via the lungs.	2.41	1	elemental vanadium; vanadium group element atom	micronutrient
phosphoric acid, trisodium salt [no description available]	2.05	1	sodium phosphate
sodium thiosulfate sodium thiosulfate: do not confuse synonym sodium hyposulfite with sodium hyposulfite, synonym for di-Na salt of dithionous acid. sodium thiosulfate : An inorganic sodium salt composed of sodium and thiosulfate ions in a 2:1 ratio.	2.05	1	inorganic sodium salt	antidote to cyanide poisoning; antifungal drug; nephroprotective agent
cesium iodide cesium iodide: X-ray image intensifier	2	1
deuterium oxide Deuterium Oxide: The isotopic compound of hydrogen of mass 2 (deuterium) with oxygen. (From Grant & Hackh's Chemical Dictionary, 5th ed) It is used to study mechanisms and rates of chemical or nuclear reactions, as well as biological processes.	2.01	1	deuterated compound; water	NMR solvent
barium nitrate barium nitrate: RN given refers to parent cpd. barium nitrate : An inorganic nitrate salt of barium.	2.46	2	inorganic barium salt; inorganic nitrate salt
barium chloride barium chloride: RN given refers to parent cpd. barium chloride : The inorganic dichloride salt of barium.	3.43	7	barium salt; inorganic chloride	potassium channel blocker
ethionine L-ethionine : An S-ethylhomocysteine that has S-configuration at the chiral centre.	1.96	1	S-ethylhomocysteine	antimetabolite; carcinogenic agent
dibenzo-18-crown-6 dibenzo-18-crown-6: structure. dibenzo-18-crown-6 : A crown ether that is 18-crown-6 ortho-fused to two benzene rings at positions 8-9 and 17-18.	7.94	4	benzenes; crown ether	phase-transfer catalyst
fluoroboric acid [no description available]	2.07	1	boron fluoride
iodine [no description available]	2	1	halide anion; monoatomic iodine	human metabolite
phenyl acetate phenyl acetate: The ester formed between phenol and acetic acid. Don't confuse with phenylacetic acid derivatives listed under PHENYLACETATES.. phenyl acetate : An acetate ester obtained by the formal condensation of phenol with acetic acid.	2.46	2	benzenes; phenyl acetates
methylformamide N-methylformamide : A member of the class of formamides having a N-methyl substituent.	2.6	1	formamides
1,4-dioxane 1,4-dioxane: dehydrating agent; polar solvent miscible both with water & most organic solvents. dioxane : Any member of the class of dioxanes that is a cyclohexane in which two carbon atoms are replaced by oxygen atoms.. 1,4-dioxane : A dioxane with oxygen atoms at positions 1 and 4.	7.6	1	dioxane; volatile organic compound	carcinogenic agent; metabolite; NMR chemical shift reference compound; non-polar solvent
pyrene pyrene: structure in Merck Index, 9th ed, #7746. pyrene : An ortho- and peri-fused polycyclic arene consisting of four fused benzene rings, resulting in a flat aromatic system.	2.46	2	ortho- and peri-fused polycyclic arene	fluorescent probe; persistent organic pollutant
alkenes [no description available]	2.1	1
nigericin Nigericin: A polyether antibiotic which affects ion transport and ATPase activity in mitochondria. It is produced by Streptomyces hygroscopicus. (From Merck Index, 11th ed). nigericin : A polyether antibiotic which affects ion transport and ATPase activity in mitochondria. It is produced by Streptomyces hygroscopicus.	1.97	1	polycyclic ether	antibacterial agent; antimicrobial agent; bacterial metabolite; potassium ionophore
paclitaxel Taxus: Genus of coniferous yew trees or shrubs, several species of which have medicinal uses. Notable is the Pacific yew, Taxus brevifolia, which is used to make the anti-neoplastic drug taxol (PACLITAXEL).	2.17	1	taxane diterpenoid; tetracyclic diterpenoid	antineoplastic agent; human metabolite; metabolite; microtubule-stabilising agent
15-crown-5 15-crown-5 : A saturated organic heteromonocyclic parent that is cyclopentadecane in which the carbon atoms at positions 1, 4, 7, 10 and 13 have been replaced by oxygen atoms to give a crown ether.	8.86	11	crown ether; saturated organic heteromonocyclic parent
bromosuccinimide Bromosuccinimide: A brominating agent that replaces hydrogen atoms in benzylic or allylic positions. It is used in the oxidation of secondary alcohols to ketones and in controlled low-energy brominations. (From Miall's Dictionary of Chemistry, 5th ed; Hawley's Condensed Chemical Dictionary, 12th ed,).	2.06	1	dicarboximide; organobromine compound; pyrrolidinone	reagent
triazoles Triazoles: Heterocyclic compounds containing a five-membered ring with two carbon atoms and three nitrogen atoms with the molecular formula C2H3N3.. triazoles : An azole in which the five-membered heterocyclic aromatic skeleton contains three N atoms and two C atoms.	2.04	1	1,2,3-triazole
quinocide quinocide: Russian drug; RN given refers to parent cpd; structure	7.46	2
chlorosulfonyl isocyanate chlorosulfonyl isocyanate: structure in first source	2.03	1
cryptating agent 222 cryptating agent 222: forms ligands with metal cations; structure	2.37	2
cryptand 2.2 cryptand 2.2: a macrocyclic diaza-crown ether; structure given in first source	2.73	3
tetracyanoquinodimethane tetracyanoquinodimethane: structure. tetracyanoquinodimethane : A quinodimethane that is p-quinodimethane in which the methylidene hydrogens are replaced by cyano groups.	2.06	1	alicyclic compound; nitrile; quinodimethane
dibenzo-24-crown-8 [no description available]	2.39	2
dicyclohexyl-18-crown-6 [no description available]	2.94	4
dibenzo-30-crown-10 dibenzo-30-crown-10: structure	2.39	2
4-isothiocyanatobenzenesulfonate 4-isothiocyanatobenzenesulfonate: inhibitors of acid extrusion; amino-reactive agent; inhibits anion fluxes in erythrocytes; RN given refers to sulfonic acid	2.03	1
3,4-dihydroxybenzylamine 3,4-dihydroxybenzylamine: RN given refers to parent cpd; structure	1.97	1	catechols
cobalt Cobalt: A trace element that is a component of vitamin B12. It has the atomic symbol Co, atomic number 27, and atomic weight 58.93. It is used in nuclear weapons, alloys, and pigments. Deficiency in animals leads to anemia; its excess in humans can lead to erythrocytosis.. cobalt(1+) : A monovalent inorganic cation obtained from cobalt.. cobalt atom : A cobalt group element atom that has atomic number 27.	2.44	2	cobalt group element atom; metal allergen	micronutrient
yttrium radioisotopes Yttrium Radioisotopes: Unstable isotopes of yttrium that decay or disintegrate emitting radiation. Y atoms with atomic weights 82-88 and 90-96 are radioactive yttrium isotopes.	2.06	1
cyanates Cyanates: Organic salts of cyanic acid containing the -OCN radical.. cyanates : Salts and esters of cyanic acid, HOC#N; compounds carrying the cyanate functional group -O-C#N.. isocyanates : Organonitrogen compounds that are derivatives of isocyanic acid; compounds containing the isocyanate functional group -N=C=O (as opposed to the cyanate group, -O-C#N).	2.03	1
dityrosine dityrosine: o,o'-biphenol analog of tyrosine; isolated from insoluble protein of human cataractous lenses; structure. dityrosine : A biphenyl compound comprising two tyrosine residues linked at carbon-3 of their benzene rings.	2.03	1	biphenyls; non-proteinogenic alpha-amino acid; tyrosine derivative	biomarker
silicon phthalocyanine pc4 [no description available]	2.07	1
4-bromomethyl-7-methoxycoumarin [no description available]	1.96	1
perchlorate perchlorate: the explosive component of rocket fuel; an environmental contaminant that disrupts THYROID HORMONES. perchlorate : A monovalent inorganic anion obtained by deprotonation of perchloric acid.	2.43	2	chlorine oxoanion; monovalent inorganic anion
methotrexate [no description available]	3.07	1	dicarboxylic acid; monocarboxylic acid amide; pteridines	abortifacient; antimetabolite; antineoplastic agent; antirheumatic drug; dermatologic drug; DNA synthesis inhibitor; EC 1.5.1.3 (dihydrofolate reductase) inhibitor; immunosuppressive agent
benzylaza-15-crown-5 benzylaza-15-crown-5: structure given in first source	2.03	1
lysyl-tyrosyl-lysine [no description available]	2.31	1	oligopeptide
zinc hematoporphyrin [no description available]	2.06	1
roxifiban roxifiban: structure in first source	2	1
povidone-iodine Povidone-Iodine: An iodinated polyvinyl polymer used as topical antiseptic in surgery and for skin and mucous membrane infections, also as aerosol. The iodine may be radiolabeled for research purposes.	2.05	1
hexacyanoferrate iii hexacyanoferrate III: RN given refers to parent cpd	2.05	1
tartaric acid tartaric acid: RN given refers to cpd with unspecified isomeric designation. D-tartaric acid : The D-enantiomer of tartaric acid.	7.69	3	tartaric acid	Escherichia coli metabolite
betadex beta-Cyclodextrins: Cyclic GLUCANS consisting of seven (7) glucopyranose units linked by 1,4-glycosidic bonds.	3.29	6	cyclodextrin
cyanoginosin lr cyanoginosin LR: cyclic heptapeptide from cyanobacterium Microcystis aeruginosa. microcystin-LR : A microcystin consisting of D-alanyl, L-leucyl, (3S)-3-methyl-D-beta-aspartyl,L-arginyl, 2S,3S,4E,6E,8S,9S)-3-amino-4,5,6,7-tetradehydro-9-methoxy-2,6,8-trimethyl-10-phenyldecanoyl, D-gamma-glutamyl, and 2,3-didehydro-N-methylalanyl residues joined into a 25-membered macrocycle. Produced by the cyanobacterium Microcystis aeruginosa, it is the most studied of the microcystins.	2.17	1	microcystin	bacterial metabolite; EC 3.1.3.16 (phosphoprotein phosphatase) inhibitor; environmental contaminant; xenobiotic
enkephalin, leucine Enkephalin, Leucine: One of the endogenous pentapeptides with morphine-like activity. It differs from MET-ENKEPHALIN in the LEUCINE at position 5. Its first four amino acid sequence is identical to the tetrapeptide sequence at the N-terminal of BETA-ENDORPHIN.. Leu-enkephalin : A pentapeptide comprising L-tyrosine, glycine, glycine, L-phenylalanine and L-leucine residues joined in sequence by peptide linkages. It is an endogenous opioid peptide produced in vertebrate species, including rodents, primates and humans that results from decomposition of proenkephalin or dynorphin and exhibits antinociceptive properties.	2.71	3	pentapeptide; peptide zwitterion	analgesic; delta-opioid receptor agonist; human metabolite; mu-opioid receptor agonist; neurotransmitter; rat metabolite
sodium perchlorate sodium perchlorate : An inorganic sodium salt comprising equal numbers of sodium and perchlorate ions.	2.03	1	inorganic sodium salt
stilbenes Stilbenes: Organic compounds that contain 1,2-diphenylethylene as a functional group.. trans-stilbene : The trans-isomer of stilbene.	2.1	1	stilbene
4-stilbazole 4-stilbazole: RN given refers to parent cpd; structure	2.06	1
sorbic acid Sorbic Acid: Mold and yeast inhibitor. Used as a fungistatic agent for foods, especially cheeses.. (2E,4E)-hexa-2,4-dienoic acid : A sorbic acid having trans-double bonds at positions 2 and 4; a food preservative that can induce cutaneous vasodilation and stinging upon topical application to humans. It is the most thermodynamically stable of the four possible geometric isomers possible, as well as the one with the highest antimicrobial activity.. sorbic acid : A hexadienoic acid with double bonds at C-2 and C-4; it has four geometrical isomers, of which the trans,trans-form is naturally occurring.	1.97	1	alpha,beta-unsaturated monocarboxylic acid; sorbic acid
4-(dicyanomethylene)-2-methyl-6-(4-(dimethylamino)styryl)-4h-pyran 2-(2-(4-(dimethylamino)styryl)-6-methyl-4H-pyran-4-ylidene)malononitrile: structure in first source	2.13	1
4'-aminobenzo-15-crown-5 4'-aminobenzo-15-crown-5: structure in first source	2.11	1
valinomycin Valinomycin: A cyclododecadepsipeptide ionophore antibiotic produced by Streptomyces fulvissimus and related to the enniatins. It is composed of 3 moles each of L-valine, D-alpha-hydroxyisovaleric acid, D-valine, and L-lactic acid linked alternately to form a 36-membered ring. (From Merck Index, 11th ed) Valinomycin is a potassium selective ionophore and is commonly used as a tool in biochemical studies.. valinomycin : A twelve-membered cyclodepsipeptide composed of three repeating D-alpha-hydroxyisovaleryl-D-valyl-L-lactoyl-L-valyl units joined in sequence. An antibiotic found in several Streptomyces strains.	2.4	2	cyclodepsipeptide; macrocycle	antimicrobial agent; antiviral agent; bacterial metabolite; potassium ionophore
lithium Lithium: An element in the alkali metals family. It has the atomic symbol Li, atomic number 3, and atomic weight [6.938; 6.997]. Salts of lithium are used in treating BIPOLAR DISORDER.	2.72	3	alkali metal atom
calixarenes Calixarenes: Phenolic metacyclophanes derived from condensation of PHENOLS and ALDEHYDES. The name derives from the vase-like molecular structures. A bracketed [n] indicates the number of aromatic rings.. calixarenes : Originally macrocyclic compounds capable of assuming a basket (or "calix") shaped conformation. They are formed from p-hydrocarbyl phenols and formaldehyde. The term now applies to a variety of derivatives by substitution of the hydrocarbon cyclo{oligo[(1,3-phenylene)methylene]}.. calixarene : A macrocycle composed of 1,3-phenylene groups linked by methylene groups. The number of 1,3-phenylene units in the macrocycle is denoted by the "n" in calix[n]arene name.	2.11	1
sodium dodecyl sulfate Sodium Dodecyl Sulfate: An anionic surfactant, usually a mixture of sodium alkyl sulfates, mainly the lauryl; lowers surface tension of aqueous solutions; used as fat emulsifier, wetting agent, detergent in cosmetics, pharmaceuticals and toothpastes; also as research tool in protein biochemistry.. sodium dodecyl sulfate : An organic sodium salt that is the sodium salt of dodecyl hydrogen sulfate.	2.05	1	organic sodium salt	detergent; protein denaturant
alpha-chymotrypsin Chymotrypsin: A serine endopeptidase secreted by the pancreas as its zymogen, CHYMOTRYPSINOGEN and carried in the pancreatic juice to the duodenum where it is activated by TRYPSIN. It selectively cleaves aromatic amino acids on the carboxyl side.	2.01	1
lead Lead: A soft, grayish metal with poisonous salts; atomic number 82, atomic weight 207.2, symbol Pb.	2.76	3	carbon group element atom; elemental lead; metal atom	neurotoxin
cesium Cesium: A member of the alkali metals. It has an atomic symbol Cs, atomic number 50, and atomic weight 132.91. Cesium has many industrial applications, including the construction of atomic clocks based on its atomic vibrational frequency.	2.73	3	alkali metal atom
barium Barium: An element of the alkaline earth group of metals. It has an atomic symbol Ba, atomic number 56, and atomic weight 138. All of its acid-soluble salts are poisonous.	2.44	2	alkaline earth metal atom; elemental barium
aluminum Aluminum: A metallic element that has the atomic number 13, atomic symbol Al, and atomic weight 26.98.	2.04	1	boron group element atom; elemental aluminium; metal atom
bismuth Bismuth: A metallic element that has the atomic symbol Bi, and atomic number 83. Its principal isotope is Bismuth 209.	2.31	1	metal atom; pnictogen
thallium Thallium: A heavy, bluish white metal, atomic number 81, atomic weight [204.382; 204.385], symbol Tl.. thallium : A metallic element first identified and named from the brilliant green line in its flame spectrum (from Greek thetaalphalambdalambdaomicronsigma, a green shoot).	2.17	1	boron group element atom
lasalocid Lasalocid: Cationic ionophore antibiotic obtained from Streptomyces lasaliensis that, among other effects, dissociates the calcium fluxes in muscle fibers. It is used as a coccidiostat, especially in poultry.. lasalocid : A polyether antibiotic used for prevention and treatment of coccidiosis in poultry.	1.96	1	beta-hydroxy ketone; monocarboxylic acid; monohydroxybenzoic acid; oxanes; oxolanes; polyether antibiotic; secondary alcohol; tertiary alcohol	bacterial metabolite; coccidiostat; ionophore
sulfur Sulfur: An element that is a member of the chalcogen family. It has an atomic symbol S, atomic number 16, and atomic weight [32.059; 32.076]. It is found in the amino acids cysteine and methionine.	2.02	1	chalcogen; nonmetal atom	macronutrient
cysteine Cysteine: A thiol-containing non-essential amino acid that is oxidized to form CYSTINE.. L-cysteinium : The L-enantiomer of cysteinium.. cysteine : A sulfur-containing amino acid that is propanoic acid with an amino group at position 2 and a sulfanyl group at position 3.	7.08	1	cysteinium	fundamental metabolite
strontium radioisotopes Strontium Radioisotopes: Unstable isotopes of strontium that decay or disintegrate spontaneously emitting radiation. Sr 80-83, 85, and 89-95 are radioactive strontium isotopes.	2.06	1
abscisic acid Abscisic Acid: Abscission-accelerating plant growth substance isolated from young cotton fruit, leaves of sycamore, birch, and other plants, and from potatoes, lemons, avocados, and other fruits.. (S)-2-trans-abscisic acid : A 2-trans-abscisic acid with (S)-configuration at the chiral centre.. (+)-abscisic acid : The naturally occurring (1'S)-(+) enantiomer of abscisic acid. It is an important sesquiterpenoid plant hormone which acts as a regulator of plant responses to environmental stresses such as drought and cold.	2.21	1	2-trans-abscisic acid
sq-23377 Ionomycin: A divalent calcium ionophore that is widely used as a tool to investigate the role of intracellular calcium in cellular processes.. ionomycin : A very long-chain fatty acid that is docosa-10,16-dienoic acid which is substituted by methyl groups at positions 4, 6, 8, 12, 14, 18 and 20, by hydroxy groups at positions 11, 19 and 21, and by a (2',5-dimethyloctahydro-2,2'-bifuran-5-yl)ethanol group at position 21. An ionophore produced by Streptomyces conglobatus, it is used in research to raise the intracellular level of Ca(2+) and as a research tool to understand Ca(2+) transport across biological membranes.	2.15	1	cyclic ether; enol; polyunsaturated fatty acid; very long-chain fatty acid	calcium ionophore; metabolite
s-nitrosocysteine S-nitrosocysteine: A sulfur-containing alkyl thionitrite that is a nitric oxide donor.. S-nitroso-L-cysteine : An L-cysteine derivative in which the sulfur atom carries a nitroso substituent. A cell-permeable low-molecular-weight nitrosothiol and nitric oxide donor.	7.08	1	L-cysteine derivative; nitrosothio compound	hematologic agent; platelet aggregation inhibitor; vasodilator agent
zeolites [no description available]	2.21	1
methionine sulfoxide methionine sulfoxide: RN given refers to cpd without isomeric designation. L-methionine (R)-S-oxide : The (R)-oxido diastereomer of L-methionine S-oxide.	2.1	1	amino acid zwitterion; L-methionine S-oxide	Escherichia coli metabolite
heptakis(2,6-o-dimethyl)beta-cyclodextrin heptakis(2,6-O-dimethyl)beta-cyclodextrin: stimulant for Bordetella pertussis Phase I	1.99	1
alpha-synuclein alpha-Synuclein: A synuclein that is a major component of LEWY BODIES and plays a role in SYNUCLEINOPATHIES, neurodegeneration and neuroprotection.	2.04	1
oxadiazoles Oxadiazoles: Compounds containing five-membered heteroaromatic rings containing two carbons, two nitrogens, and one oxygen atom which exist in various regioisomeric forms.	2.06	1
cellulose DEAE-Cellulose: Cellulose derivative used in chromatography, as ion-exchange material, and for various industrial applications.	7.41	1	glycoside
sodium nitrite Sodium Nitrite: Nitrous acid sodium salt. Used in many industrial processes, in meat curing, coloring, and preserving, and as a reagent in ANALYTICAL CHEMISTRY TECHNIQUES. It is used therapeutically as an antidote in cyanide poisoning. The compound is toxic and mutagenic and will react in vivo with secondary or tertiary amines thereby producing highly carcinogenic nitrosamines.. sodium nitrite : An inorganic sodium salt having nitrite as the counterion. Used as a food preservative and antidote to cyanide poisoning.	2.08	1	inorganic sodium salt; nitrite salt	antidote to cyanide poisoning; antihypertensive agent; antimicrobial food preservative; food antioxidant; poison
4,4-difluoro-4-bora-3a,4a-diaza-s-indacene [no description available]	2.17	1	BODIPY compound
ascorbic acid Ascorbic Acid: A six carbon compound related to glucose. It is found naturally in citrus fruits and many vegetables. Ascorbic acid is an essential nutrient in human diets, and necessary to maintain connective tissue and bone. Its biologically active form, vitamin C, functions as a reducing agent and coenzyme in several metabolic pathways. Vitamin C is considered an antioxidant.. L-ascorbic acid : The L-enantiomer of ascorbic acid and conjugate acid of L-ascorbate.. L-ascorbate : The L-enantiomer of ascorbate and conjugate base of L-ascorbic acid, arising from selective deprotonation of the 3-hydroxy group. Required for a range of essential metabolic reactions in all animals and plants.. vitamin C : Any member of a group of vitamers that belong to the chemical structural class called butenolides that exhibit biological activity against vitamin C deficiency in animals. The vitamers include L-ascorbic acid and its salt, ionized and oxidized forms.	2.71	3	ascorbic acid; vitamin C	coenzyme; cofactor; flour treatment agent; food antioxidant; food colour retention agent; geroprotector; plant metabolite; skin lightening agent
salicylates Salicylates: The salts or esters of salicylic acids, or salicylate esters of an organic acid. Some of these have analgesic, antipyretic, and anti-inflammatory activities by inhibiting prostaglandin synthesis.. hydroxybenzoate : Any benzoate derivative carrying a single carboxylate group and at least one hydroxy substituent.. salicylates : Any salt or ester arising from reaction of the carboxy group of salicylic acid, or any ester resulting from the condensation of the phenolic hydroxy group of salicylic acid with an organic acid.. salicylate : A monohydroxybenzoate that is the conjugate base of salicylic acid.	2.08	1	monohydroxybenzoate	plant metabolite
warfarin Warfarin: An anticoagulant that acts by inhibiting the synthesis of vitamin K-dependent coagulation factors. Warfarin is indicated for the prophylaxis and/or treatment of venous thrombosis and its extension, pulmonary embolism, and atrial fibrillation with embolization. It is also used as an adjunct in the prophylaxis of systemic embolism after myocardial infarction. Warfarin is also used as a rodenticide.. warfarin : A racemate comprising equal amounts of (R)- and (S)-warfarin. Extensively used as both an anticoagulant drug and as a pesticide against rats and mice.. 4-hydroxy-3-(3-oxo-1-phenylbutyl)-1-benzopyran-2-one : A member of the class of coumarins that is 4-hydroxycoumarin which is substituted at position 3 by a 1-phenyl-3-oxo-1-butyl group.	1.97	1	benzenes; hydroxycoumarin; methyl ketone
phthalocyanine phthalocyanine : A tetrapyrrole fundamental parent that consists of four isoindole-type units, with the connecting carbon atoms in the macrocycle replaced by nitrogen.	2.06	1	phthalocyanines; tetrapyrrole fundamental parent
nitrophenols Nitrophenols: PHENOLS carrying nitro group substituents.	2.05	1
deoxyguanosine [no description available]	2.21	1	purine 2'-deoxyribonucleoside; purines 2'-deoxy-D-ribonucleoside	Escherichia coli metabolite; human metabolite; mouse metabolite; Saccharomyces cerevisiae metabolite
folic acid folcysteine: used to promote fertility in chickens. vitamin B9 : Any B-vitamin that exhibits biological activity against vitamin B9 deficiency. Vitamin B9 refers to the many forms of folic acid and its derivatives, including tetrahydrofolic acid (the active form), methyltetrahydrofolate (the primary form found in blood), methenyltetrahydrofolate, folinic acid amongst others. They are present in abundance in green leafy vegetables, citrus fruits, and animal products. Lack of vitamin B9 leads to anemia, a condition in which the body cannot produce sufficient number of red blood cells. Symptoms of vitamin B9 deficiency include fatigue, muscle weakness, and pale skin.	3.07	1	folic acids; N-acyl-amino acid	human metabolite; mouse metabolite; nutrient
diazeniumdiolate diazeniumdiolate: a class of nitric oxide (NO) donors; structure in first source. 1,1-diethyl-2-hydroxy-3-oxotriazane : A nitroso compound that is triazane in which the the nitrogen at position 1 is substituted by two ethyl groups, that at position 2 is substituted by a hydroxy group, and that at position 3 is substituted by an oxo group.	2.41	1
8-hydroxy-2'-deoxyguanosine 8-Hydroxy-2'-Deoxyguanosine: Common oxidized form of deoxyguanosine in which C-8 position of guanine base has a carbonyl group.. 8-hydroxy-2'-deoxyguanosine : Guanosine substituted at the purine 8-position by a hydroxy group. It is used as a biomarker of oxidative DNA damage.	2.21	1	guanosines	biomarker
imidacloprid imidacloprid: systemic & contact insecticide exhibiting low mammalian toxicity; structure given in first source; it is one of the neonicotinoid insecticides, which acts as an antagonist by binding to postsynaptic nicotinic receptors in the insect central nervous system. imidacloprid : An imidazolidine that is N-nitroimidazolidin-2-imine bearing a (6-chloro-3-pyridinyl)methyl substituent at position 1.	2.05	1	imidacloprid; imidazolidines; monochloropyridine	environmental contaminant; genotoxin; neonicotinoid insectide; nicotinic acetylcholine receptor agonist; xenobiotic
concanavalin a Concanavalin A: A MANNOSE/GLUCOSE binding lectin isolated from the jack bean (Canavalia ensiformis). It is a potent mitogen used to stimulate cell proliferation in lymphocytes, primarily T-lymphocyte, cultures.	2.01	1

Condition	Relationship Strength	Studies
Besnoitiasis [description not available]	1.96	1
Benign Neoplasms [description not available]	3.05	4
Neoplasms New abnormal growth of tissue. Malignant neoplasms show a greater degree of anaplasia and have the properties of invasion and metastasis, compared to benign neoplasms.	3.05	4
Diabetes Mellitus A heterogeneous group of disorders characterized by HYPERGLYCEMIA and GLUCOSE INTOLERANCE.	2.25	1
Keratitis, Ulcerative [description not available]	2.25	1
Disease Models, Animal Naturally-occurring or experimentally-induced animal diseases with pathological processes analogous to human diseases.	2.25	1
Corneal Ulcer Loss of epithelial tissue from the surface of the cornea due to progressive erosion and necrosis of the tissue; usually caused by bacterial, fungal, or viral infection.	2.25	1
Inborn Errors of Metabolism [description not available]	7.08	1
Metabolism, Inborn Errors Errors in metabolic processes resulting from inborn genetic mutations that are inherited or acquired in utero.	2.08	1
Pulmonary Sarcoidosis [description not available]	2.11	1
Airflow Obstruction, Chronic [description not available]	2.11	1
Asthma, Bronchial [description not available]	2.11	1
Cystic Fibrosis of Pancreas [description not available]	2.11	1
Alveolitis, Fibrosing [description not available]	2.11	1
Asthma A form of bronchial disorder with three distinct components: airway hyper-responsiveness (RESPIRATORY HYPERSENSITIVITY), airway INFLAMMATION, and intermittent AIRWAY OBSTRUCTION. It is characterized by spasmodic contraction of airway smooth muscle, WHEEZING, and dyspnea (DYSPNEA, PAROXYSMAL).	2.11	1
Cystic Fibrosis An autosomal recessive genetic disease of the EXOCRINE GLANDS. It is caused by mutations in the gene encoding the CYSTIC FIBROSIS TRANSMEMBRANE CONDUCTANCE REGULATOR expressed in several organs including the LUNG, the PANCREAS, the BILIARY SYSTEM, and the SWEAT GLANDS. Cystic fibrosis is characterized by epithelial secretory dysfunction associated with ductal obstruction resulting in AIRWAY OBSTRUCTION; chronic RESPIRATORY INFECTIONS; PANCREATIC INSUFFICIENCY; maldigestion; salt depletion; and HEAT PROSTRATION.	2.11	1
Pulmonary Fibrosis A process in which normal lung tissues are progressively replaced by FIBROBLASTS and COLLAGEN causing an irreversible loss of the ability to transfer oxygen into the bloodstream via PULMONARY ALVEOLI. Patients show progressive DYSPNEA finally resulting in death.	2.11	1
Sarcoidosis, Pulmonary Sarcoidosis affecting predominantly the lungs, the site most frequently involved and most commonly causing morbidity and mortality in sarcoidosis. Pulmonary sarcoidosis is characterized by sharply circumscribed granulomas in the alveolar, bronchial, and vascular walls, composed of tightly packed cells derived from the mononuclear phagocyte system. The clinical symptoms when present are dyspnea upon exertion, nonproductive cough, and wheezing. (Cecil Textbook of Medicine, 19th ed, p431)	2.11	1
Pulmonary Disease, Chronic Obstructive A disease of chronic diffuse irreversible airflow obstruction. Subcategories of COPD include CHRONIC BRONCHITIS and PULMONARY EMPHYSEMA.	2.11	1
Electrolytes Substances that dissociate into two or more ions, to some extent, in water. Solutions of electrolytes thus conduct an electric current and can be decomposed by it (ELECTROLYSIS). (Grant & Hackh's Chemical Dictionary, 5th ed)	3.11	5
BH4 Deficiency [description not available]	2.54	2
Phenylketonurias A group of autosomal recessive disorders marked by a deficiency of the hepatic enzyme PHENYLALANINE HYDROXYLASE or less frequently by reduced activity of DIHYDROPTERIDINE REDUCTASE (i.e., atypical phenylketonuria). Classical phenylketonuria is caused by a severe deficiency of phenylalanine hydroxylase and presents in infancy with developmental delay; SEIZURES; skin HYPOPIGMENTATION; ECZEMA; and demyelination in the central nervous system. (From Adams et al., Principles of Neurology, 6th ed, p952).	2.54	2
Candida Infection [description not available]	2.13	1
Infections, Staphylococcal [description not available]	2.13	1
Candidiasis Infection with a fungus of the genus CANDIDA. It is usually a superficial infection of the moist areas of the body and is generally caused by CANDIDA ALBICANS. (Dorland, 27th ed)	2.13	1
Staphylococcal Infections Infections with bacteria of the genus STAPHYLOCOCCUS.	2.13	1
4 Hydroxyphenylpyruvate Dioxygenase Deficiency Disease [description not available]	2.15	1
Tyrosinemias A group of disorders which have in common elevations of tyrosine in the blood and urine secondary to an enzyme deficiency. Type I tyrosinemia features episodic weakness, self-mutilation, hepatic necrosis, renal tubular injury, and seizures and is caused by a deficiency of the enzyme fumarylacetoacetase. Type II tyrosinemia features INTELLECTUAL DISABILITY, painful corneal ulcers, and keratoses of the palms and plantar surfaces and is caused by a deficiency of the enzyme TYROSINE TRANSAMINASE. Type III tyrosinemia features INTELLECTUAL DISABILITY and is caused by a deficiency of the enzyme 4-HYDROXYPHENYLPYRUVATE DIOXYGENASE. (Menkes, Textbook of Child Neurology, 5th ed, pp42-3)	2.15	1
Sensitivity and Specificity Binary classification measures to assess test results. Sensitivity or recall rate is the proportion of true positives. Specificity is the probability of correctly determining the absence of a condition. (From Last, Dictionary of Epidemiology, 2d ed)	3.3	6
Nervous System Disorders [description not available]	1.95	1
Nervous System Diseases Diseases of the central and peripheral nervous system. This includes disorders of the brain, spinal cord, cranial nerves, peripheral nerves, nerve roots, autonomic nervous system, neuromuscular junction, and muscle.	1.95	1

18-crown-6

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Research Demand Index: 52.73

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