Page last updated: 2024-10-24

xanthine catabolic process

Definition

Target type: biologicalprocess

The chemical reactions and pathways resulting in the breakdown of xanthine, 2,6-dihydroxypurine, a purine formed in the metabolic breakdown of guanine but not present in nucleic acids. [GOC:go_curators]

Xanthine catabolism is the biological process that breaks down xanthine, a purine base, into uric acid. This process occurs primarily in the liver and involves two key enzymes: xanthine oxidase and xanthine dehydrogenase.

**Step 1: Xanthine oxidation:**
- Xanthine oxidase catalyzes the oxidation of xanthine to uric acid.
- This reaction requires molecular oxygen and produces hydrogen peroxide as a byproduct.
- Xanthine oxidase can also oxidize hypoxanthine to xanthine, providing a precursor for uric acid production.

**Step 2: Uric acid production:**
- Uric acid is the final product of purine catabolism in humans and other primates.
- It is a relatively insoluble compound that is excreted in urine.

**Regulation of xanthine catabolism:**
- The activity of xanthine oxidase is regulated by several factors, including dietary purine intake, oxygen availability, and hormonal signals.
- Elevated levels of purine intake can increase xanthine oxidase activity and lead to increased uric acid production.
- Reduced oxygen availability can also stimulate xanthine oxidase activity.

**Clinical significance:**
- Disorders of xanthine catabolism can lead to the accumulation of xanthine and hypoxanthine, which can cause health problems such as gout, kidney stones, and Lesch-Nyhan syndrome.
- Gout is a painful inflammatory condition characterized by the deposition of uric acid crystals in joints.
- Kidney stones can form when uric acid levels in the urine become too high.
- Lesch-Nyhan syndrome is a rare genetic disorder that results in a deficiency in the enzyme hypoxanthine-guanine phosphoribosyltransferase, leading to severe hyperuricemia and neurological complications.

**Therapeutic interventions:**
- Drugs that inhibit xanthine oxidase, such as allopurinol and febuxostat, are used to lower uric acid levels in patients with gout and other hyperuricemia-related disorders.
- Dietary modifications, such as reducing purine-rich foods, can also help lower uric acid levels.'
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Proteins (2)

ProteinDefinitionTaxonomy
Xanthine dehydrogenase/oxidaseA xanthine dehydrogenase/oxidase that is encoded in the genome of cow. [PMID:8708081, PRO:HJD]Bos taurus (cattle)
Xanthine dehydrogenase/oxidaseA xanthine dehydrogenase/oxidase that is encoded in the genome of human. [PRO:DNx, UniProtKB:P47989]Homo sapiens (human)

Compounds (125)

CompoundDefinitionClassesRoles
protocatechuic acid3,4-dihydroxybenzoic acid : A dihydroxybenzoic acid in which the hydroxy groups are located at positions 3 and 4.

protocatechuic acid: RN given refers to parent cpd; structure
catechols;
dihydroxybenzoic acid
antineoplastic agent;
EC 1.1.1.25 (shikimate dehydrogenase) inhibitor;
EC 1.14.11.2 (procollagen-proline dioxygenase) inhibitor;
human xenobiotic metabolite;
plant metabolite
adenine6-aminopurines;
purine nucleobase
Daphnia magna metabolite;
Escherichia coli metabolite;
human metabolite;
mouse metabolite;
Saccharomyces cerevisiae metabolite
salicylic acidScalp: 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).monohydroxybenzoic acidalgal metabolite;
antifungal agent;
antiinfective agent;
EC 1.11.1.11 (L-ascorbate peroxidase) inhibitor;
keratolytic drug;
plant hormone;
plant metabolite
taxifolin3'-hydroxyflavanones;
4'-hydroxyflavanones;
dihydroflavonols;
pentahydroxyflavanone;
secondary alpha-hydroxy ketone
5,6-dimethylbenzimidazole5,6-dimethylbenzimidazole : A dimethylbenzimidazole carrying methyl substituents at positions 5 and 6.

5,6-dimethylbenzimidazole: RN given refers to parent cpd
dimethylbenzimidazoleEscherichia coli metabolite;
human metabolite
niacinNiacin: A water-soluble vitamin of the B complex occurring in various animal and plant tissues. It is required by the body for the formation of coenzymes NAD and NADP. It has PELLAGRA-curative, vasodilating, and antilipemic properties.

nicotinic acid : A pyridinemonocarboxylic acid that is pyridine in which the hydrogen at position 3 is replaced by a carboxy group.

vitamin B3 : Any member of a group of vitamers that belong to the chemical structural class called pyridines that exhibit biological activity against vitamin B3 deficiency. Vitamin B3 deficiency causes a condition known as pellagra whose symptoms include depression, dermatitis and diarrhea. The vitamers include nicotinic acid and nicotinamide (and their ionized and salt forms).
pyridine alkaloid;
pyridinemonocarboxylic acid;
vitamin B3
antidote;
antilipemic drug;
EC 3.5.1.19 (nicotinamidase) inhibitor;
Escherichia coli metabolite;
human urinary metabolite;
metabolite;
mouse metabolite;
plant metabolite;
vasodilator agent
xanthine7H-xanthine : An oxopurine in which the purine ring is substituted by oxo groups at positions 2 and 6 and N-7 is protonated.

9H-xanthine : An oxopurine in which the purine ring is substituted by oxo groups at positions 2 and 6 and N-9 is protonated.
xanthineSaccharomyces cerevisiae metabolite
beta-naphthoflavonebeta-naphthoflavone : An extended flavonoid resulting from the formal fusion of a benzene ring with the f side of flavone.

beta-Naphthoflavone: A polyaromatic hydrocarbon inducer of P4501A1 and P4501A2 cytochromes. (Proc Soc Exp Biol Med 1994 Dec:207(3):302-308)
extended flavonoid;
naphtho-gamma-pyrone;
organic heterotricyclic compound
aryl hydrocarbon receptor agonist
propyl gallatePropyl Gallate: Antioxidant for foods, fats, oils, ethers, emulsions, waxes, and transformer oils.trihydroxybenzoic acid
methyl gallatemethyl 3,4,5-trihydroxybenzoate : A gallate ester obtained by the formal condensation of gallic acid with methanol. It exhibits anti-oxidant, anti-tumor, anti-microbial and anti-inflammatory properties.

methyl gallate: has both immunosuppressive and phytogenic antineoplastic activities; isolated from Acer saccharinum
gallate esteranti-inflammatory agent;
antioxidant;
plant metabolite
methylparabenmethylparaben : A 4-hydroxybenzoate ester resulting from the formal condensation of the carboxy group of 4-hydroxybenzoic acid with methanol. It is the most frequently used antimicrobial preservative in cosmetics. It occurs naturally in several fruits, particularly in blueberries.

methylparaben: used as a preservative in cosmetics but potentiates UV-induced damage of skin; RN given refers to parent cpd
parabenantifungal agent;
antimicrobial food preservative;
neuroprotective agent;
plant metabolite
vanillic acidvanillic acid : A monohydroxybenzoic acid that is 4-hydroxybenzoic acid substituted by a methoxy group at position 3.

Vanillic Acid: A flavoring agent. It is the intermediate product in the two-step bioconversion of ferulic acid to vanillin. (J Biotechnol 1996;50(2-3):107-13).
methoxybenzoic acid;
monohydroxybenzoic acid
plant metabolite
catechin(+)-catechin : The (+)-enantiomer of catechin and a polyphenolic antioxidant plant metabolite.

catechin : Members of the class of hydroxyflavan that have a flavan-3-ol skeleton and its substituted derivatives.

Catechin: An antioxidant flavonoid, occurring especially in woody plants as both (+)-catechin and (-)-epicatechin (cis) forms.

rac-catechin : A racemate comprising equimolar amounts of (+)- and (-)-catechin
catechinantioxidant;
plant metabolite
2-aminopurine2-aminopurine : The parent compound of the 2-aminopurines, comprising a purine core carrying an amino substituent at the 2-position.

2-Aminopurine: A purine that is an isomer of ADENINE (6-aminopurine).

aminopurine : Any purine having at least one amino substituent.
2-aminopurines;
nucleobase analogue
antimetabolite
3-hydroxyflavone3-hydroxyflavone: structure given in first source

flavonol : A monohydroxyflavone that is the 3-hydroxy derivative of flavone.
flavonols;
monohydroxyflavone
alpha-naphthoflavonealpha-naphthoflavone : An extended flavonoid resulting from the formal fusion of a benzene ring with the h side of flavone. A synthetic compound, it is an inhibitor of aromatase (EC 1.14.14.14).

alpha-naphthoflavone: inhibits P4501A1 and P4501A2; stimulates some activities of P4503A4
extended flavonoid;
naphtho-gamma-pyrone;
organic heterotricyclic compound
aryl hydrocarbon receptor agonist;
aryl hydrocarbon receptor antagonist;
EC 1.14.14.14 (aromatase) inhibitor
5-methylbenzimidazole5-methyl-1H-benzimidazole : A member of the class of imidazoles that is 1H-benzimidazole in which the hydrogen at position 5 is substituted by a methyl group.

5-methylbenzimidazole: structure in first source
imidazoles
isovanillinisovanillin : A member of the class of benzaldehydes that is 4-methoxybenzaldehyde substituted by a hydroxy group at position 3. It is an inhibitor of aldehyde oxidase.

isovanillin: inhibits aldehyde oxidase
benzaldehydes;
monomethoxybenzene;
phenols
animal metabolite;
antidiarrhoeal drug;
antifungal agent;
EC 1.2.3.1 (aldehyde oxidase) inhibitor;
HIV protease inhibitor;
plant metabolite
3-hydroxy-1-benzopyran-2-one3-hydroxycoumarin: Photoprotective from sea urchin gametes and embryonic cells; structure in first source

hydroxycoumarin : Any coumarin carrying at least one hydroxy substituent.
hydroxycoumarin
butylated hydroxyanisole
2,6-diaminopurine9H-purine-2,6-diamine : A member of the class of 2,6-diaminopurines that is 9H-purine in which the hydrogens at positions 2 and 6 are replaced by amino groups.2,6-diaminopurines;
primary amino compound
antineoplastic agent
6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acidchromanol;
monocarboxylic acid;
phenols
antioxidant;
ferroptosis inhibitor;
neuroprotective agent;
radical scavenger;
Wnt signalling inhibitor
1,2,3,4,6-pentakis-O-galloyl-beta-D-glucose1,2,3,4,6-pentakis-O-galloyl-beta-D-glucose : A galloyl-beta-D-glucose compound having five galloyl groups in the 1-, 2-, 3-, 4- and 6-positions.

pentagalloylglucose: pentahydroxy gallic acid ester of glucose; a phytogenic antineoplastic agent and antibacterial agent
gallate ester;
galloyl beta-D-glucose
anti-inflammatory agent;
antineoplastic agent;
geroprotector;
hepatoprotective agent;
plant metabolite;
radiation protective agent;
radical scavenger
o-(6)-methylguanine6-O-methylguanine : A methylguanine in which the methyl group is positioned on the oxygen at position 6. Formed in DNA by alkylation of the oxygen atom of guanine, most often by N-nitroso compounds and sometimes due to methylation by other compounds such as endogenous S-adenosylmethionine, it base-pairs to thymine rather than cytidine, causing a G:C to A:T transition in DNA.

methylguanine : A 2-aminopurine that is guanine bearing a single methyl substituent.

O-(6)-methylguanine: structure
methylguaninemutagen
secoisolariciresinol(-)-secoisolariciresinol : An enantiomer of secoisolariciresinol having (-)-(2R,3R)-configuration.

secoisolariciresinol : A lignan that is butane-1,4-diol in which the 2 and 3 positions are substituted by 4-hydroxy-3-methoxybenzyl groups

secoisolariciresinol: RN given refers to ((R-(R*,R*))-isomer); RN for cpd without isomeric designation not available 8/89; precursor of lignans found in human urine; structure given in first source
secoisolariciresinolantidepressant;
phytoestrogen;
plant metabolite
2,4,6-trihydroxybenzoic acidhydroxybenzoic acid
tangeretinpentamethoxyflavone : A methoxyflavone that is flavone substituted by a five methoxy groups.

tangeretin : A pentamethoxyflavone flavone with methoxy groups at positions 4', 5, 6 , 7 and 8.

tangeretin: structure given in first source; from citrus plants; inhibits invasion of MO4 mouse cells into embryonic chick heart in vitro
pentamethoxyflavoneantineoplastic agent;
plant metabolite
isoscopoletinisoscopoletin : A hydroxycoumarin that is esculetin in which the hydroxy group at position 7 is replaced by a methoxy group. It is the major primary metabolite of scoparone.aromatic ether;
hydroxycoumarin
plant metabolite
2-hydroxychavicol2-hydroxychavicol: antimutagen from betel leaf; structure given in first source
epicatechin(-)-epicatechin : A catechin with (2R,3R)-configuration.catechin;
polyphenol
antioxidant
gallocatechol(-)-epigallocatechin : A flavan-3,3',4',5,5',7-hexol having (2R,3R)-configuration.catechin;
flavan-3,3',4',5,5',7-hexol
antioxidant;
food component;
plant metabolite
nobiletinnobiletin : A methoxyflavone that is flavone substituted by methoxy groups at positions 5, 6, 7, 8, 3' and 4' respectively.methoxyflavoneantineoplastic agent;
plant metabolite
5-bromocytosine
4-aminopyrazolo(3,4-d)pyrimidine4-aminopyrazolo(3,4-d)pyrimidine: adenine analog which suppresses growth of E coli & Bacillus cereus; inhibits cell growth & purine biosynthesis in rat hepatoma
1-methylxanthine1-methyl-7H-xanthine : A 1-methylxanthine tautomer where the imidazole proton is located at the 7-position.

1-methylxanthine : A monomethylxanthine having the methyl group located at the 1-position. It is a metabolite of caffeine in humans.

1-methylxanthine: urinary metabolite of caffeine
1-methylxanthinemouse metabolite
monocerinmonocerin: structure in first sourcehydroxybenzoic acidmetabolite
geniposideterpene glycoside
liquiritigenin4',7-dihydroxyflavanone : A dihydroxyflavanone in which the two hydroxy substituents are located at positions 4' and 7.

liquiritigenin : A dihydroxyflavanone compound having the two hydroxy substituents at the 4'- and 7-positions. Isolated from the root of Glycyrrhizae uralensis, it is a selective agonist for oestrogen receptor beta.

liquiritigenin: structure given in first source; isolated from Pterocarpus marsupium
4',7-dihydroxyflavanonehormone agonist;
plant metabolite
aromadedrin(+)-dihydrokaempferol : A tetrahydroxyflavanone having hydroxy groupa at the 3-, 4'-, 5- and 7-positions.

aromadedrin: inhibits protein kinase C; the dihydro makes it a flavone rather than a flavonol
4'-hydroxyflavanones;
dihydroflavonols;
secondary alpha-hydroxy ketone;
tetrahydroxyflavanone
metabolite
febuxostatfebuxostat : A 1,3-thiazolemonocarboxylic acid that is 4-methyl-1,3-thiazole-5-carboxylic acid which is substituted by a 3-cyano-4-(2-methylpropoxy)phenyl group at position 2. It is an orally-active, potent, and selective xanthine oxidase inhibitor used for the treatment of chronic hyperuricaemia in patients with gout.

Febuxostat: A thiazole derivative and inhibitor of XANTHINE OXIDASE that is used for the treatment of HYPERURICEMIA in patients with chronic GOUT.
1,3-thiazolemonocarboxylic acid;
aromatic ether;
nitrile
EC 1.17.3.2 (xanthine oxidase) inhibitor
cirsimarincirsimarin: a flavone glycoside from Microtea debilis; structure given in first sourceflavonoids;
glycoside
4'-hydroxyflavanone4'-hydroxyflavanone: structure in first source

4'-hydroxyflavanones : Any hydroxyflavanone having a hydroxy substituent located at position 4'.
4'-hydroxyflavanones;
monohydroxyflavanone
rubrofusarin Brubrofusarin B : A benzochromenone that is rubrofusarin in which the hydroxy group at position 6 has been converted to the corresponding methyl ether.aromatic ether;
benzochromenone;
naphtho-gamma-pyrone;
phenols;
polyketide
Aspergillus metabolite
yemuoside ym(10)yemuoside YM(10): from Stauntonia chinensis Decne; structure given in first source
1-acetyl-3,5-diphenyl-4,5-dihydro-(1h)-pyrazole
methyl 3,4-dihydroxybenzoatecatechols;
methyl ester
antioxidant;
neuroprotective agent;
plant metabolite
naringenin(S)-naringenin : The (S)-enantiomer of naringenin.(2S)-flavan-4-one;
naringenin
expectorant;
plant metabolite
geniposidic acidterpene glycoside
ferulic acidferulate : A monocarboxylic acid anion obtained by the deprotonation of the carboxy group of ferulic acid.ferulic acidsanti-inflammatory agent;
antioxidant;
apoptosis inhibitor;
cardioprotective agent;
MALDI matrix material;
plant metabolite
y-700
trans-4-coumaric acid4-coumaric acid : A coumaric acid in which the hydroxy substituent is located at C-4 of the phenyl ring.

hydroxycinnamic acid : Any member of the class of cinnamic acids carrying one or more hydroxy substituents.

trans-4-coumaric acid : The trans-isomer of 4-coumaric acid.
4-coumaric acidfood component;
mouse metabolite;
plant metabolite
2'-hydroxychalcone2'-hydroxychalcone : A member of the class of chalcones that is trans-chalcone substituted by a hydroxy group at position 2'.chalcones;
phenols
anti-inflammatory agent
2,2'-dihydroxychalcone2,2'-dihydroxychalcone: an antineoplastic agent; structure in first source
isoliquiritigeninchalconesantineoplastic agent;
biological pigment;
EC 1.14.18.1 (tyrosinase) inhibitor;
GABA modulator;
geroprotector;
metabolite;
NMDA receptor antagonist
1-benzyl-2-phenylbenzimidazole1-benzyl-2-phenylbenzimidazole: has antineoplastic activity; structure in first source
thioguanine anhydrousThioguanine: An antineoplastic compound which also has antimetabolite action. The drug is used in the therapy of acute leukemia.

tioguanine : A 2-aminopurine that is the 6-thiono derivative of 2-amino-1,9-dihydro-6H-purine. Incorporates into DNA and inhibits synthesis. Used in the treatment of leukaemia.
2-aminopurinesanticoronaviral agent;
antimetabolite;
antineoplastic agent
6-(4-methoxyphenyl)pyrimidine-2,4-diaminepyrimidines
silybin
merbaronemerbarone: structure given in first source
2',3-dihydroxychalcone2',3-dihydroxychalcone: structure in first source
quercetin7-hydroxyflavonol;
pentahydroxyflavone
antibacterial agent;
antineoplastic agent;
antioxidant;
Aurora kinase inhibitor;
chelator;
EC 1.10.99.2 [ribosyldihydronicotinamide dehydrogenase (quinone)] inhibitor;
geroprotector;
phytoestrogen;
plant metabolite;
protein kinase inhibitor;
radical scavenger
acacetin5,7-dihydroxy-4'-methoxyflavone : A monomethoxyflavone that is the 4'-methyl ether derivative of apigenin.dihydroxyflavone;
monomethoxyflavone
anticonvulsant;
plant metabolite
apigeninChamomile: Common name for several daisy-like plants (MATRICARIA; TRIPLEUROSPERMUM; ANTHEMIS; CHAMAEMELUM) native to Europe and Western Asia, now naturalized in the United States and Australia.trihydroxyflavoneantineoplastic agent;
metabolite
luteolin3'-hydroxyflavonoid;
tetrahydroxyflavone
angiogenesis inhibitor;
anti-inflammatory agent;
antineoplastic agent;
apoptosis inducer;
c-Jun N-terminal kinase inhibitor;
EC 2.3.1.85 (fatty acid synthase) inhibitor;
immunomodulator;
nephroprotective agent;
plant metabolite;
radical scavenger;
vascular endothelial growth factor receptor antagonist
quercitrinalpha-L-rhamnoside;
monosaccharide derivative;
quercetin O-glycoside;
tetrahydroxyflavone
antileishmanial agent;
antioxidant;
EC 1.1.1.184 [carbonyl reductase (NADPH)] inhibitor;
EC 1.1.1.21 (aldehyde reductase) inhibitor;
EC 1.14.18.1 (tyrosinase) inhibitor;
plant metabolite
coniferaldehydeconiferaldehyde: from aqueous extract of Senra incana

coniferyl aldehyde : A member of the class of cinnamaldehydes that is cinnamaldehyde substituted by a hydroxy group at position 4 and a methoxy group at position 3.
cinnamaldehydes;
guaiacols;
phenylpropanoid
antifungal agent;
plant metabolite
daphnetinhydroxycoumarin
luteolin-7-glucosideluteolin 7-O-beta-D-glucoside : A glycosyloxyflavone that is luteolin substituted by a beta-D-glucopyranosyl moiety at position 7 via a glycosidic linkage.

luteolin-7-glucoside: has both antiasthmatic and antineoplastic activities; has 3C protease inhibitory activity; isolated from Ligustrum lucidum
beta-D-glucoside;
glycosyloxyflavone;
monosaccharide derivative;
trihydroxyflavone
antioxidant;
plant metabolite
chrysoeriol4',5,7-trihydroxy-3'-methoxyflavone : The 3'-O-methyl derivative of luteolin.

chrysoeriol: isolated from leaves of Eurya japonica & E. emarginata
monomethoxyflavone;
trihydroxyflavone
antineoplastic agent;
antioxidant;
metabolite
quercetin 3-o-methyl ether3',4',5,7-tetrahydroxy-3-methoxyflavone : A tetrahydroxyflavone having the 4-hydroxy groups located at the 3'- 4'- 5- and 7-positions as well as a methoxy group at the 2-position.

quercetin 3-O-methyl ether: from Rhamnus species; structure in first source
monomethoxyflavone;
tetrahydroxyflavone
antimicrobial agent;
metabolite
quercetin 3-o-glucopyranosidequercetin 3-O-beta-D-glucopyranoside : A quercetin O-glucoside that is quercetin with a beta-D-glucosyl residue attached at position 3. Isolated from Lepisorus contortus, it exhibits antineoplastic activityand has been found to decrease the rate of polymerization and sickling of red blood cells

quercetin 3-O-glucopyranoside: structure in first source
beta-D-glucoside;
monosaccharide derivative;
quercetin O-glucoside;
tetrahydroxyflavone
antineoplastic agent;
antioxidant;
antipruritic drug;
bone density conservation agent;
geroprotector;
histamine antagonist;
osteogenesis regulator;
plant metabolite
rutinHydroxyethylrutoside: Monohydroxyethyl derivative of rutin. Peripheral circulation stimulant used in treatment of venous disorders.disaccharide derivative;
quercetin O-glucoside;
rutinoside;
tetrahydroxyflavone
antioxidant;
metabolite
3-methylkaempferol3-methoxyapigenin : A trihydroxyflavone that is apigenin substituted by a methoxy group at position 3.

3-methylkaempferol: structure in first source
monomethoxyflavone;
trihydroxyflavone
plant metabolite
kaempferol7-hydroxyflavonol;
flavonols;
tetrahydroxyflavone
antibacterial agent;
geroprotector;
human blood serum metabolite;
human urinary metabolite;
human xenobiotic metabolite;
plant metabolite
genistein7-hydroxyisoflavonesantineoplastic agent;
EC 5.99.1.3 [DNA topoisomerase (ATP-hydrolysing)] inhibitor;
geroprotector;
human urinary metabolite;
phytoestrogen;
plant metabolite;
tyrosine kinase inhibitor
buteinchalcones;
polyphenol
antineoplastic agent;
antioxidant;
EC 1.1.1.21 (aldehyde reductase) inhibitor;
geroprotector;
hypoglycemic agent;
plant metabolite;
radiosensitizing agent;
tyrosine kinase inhibitor
okaninokanin : A member of the class of chalcones that is trans-chalcone substituted by hydroxy groups at positions 3, 4, 2', 3', and 4' respectively.

okanin: hypoglycemic from Coreopsis tinctoria; structure in first source
benzenetriol;
chalcones
plant metabolite
sulfuretinsulfuretin: the chalcone C ring closes into a 5 instead of the more typical 6 membered ring leaving a phenyl methane at the 2 position instead of the typical phenyl1-benzofurans
esculetinesculetin : A hydroxycoumarin that is umbelliferone in which the hydrogen at position 6 is substituted by a hydroxy group. It is used in filters for absorption of ultraviolet light.

esculetin: used in filters for absorption of ultraviolet light; structure
hydroxycoumarinantioxidant;
plant metabolite;
ultraviolet filter
7-hydroxycoumarin7-oxycoumarin: derivatives have anti-oxidant properties

umbelliferone : A hydroxycoumarin that is coumarin substituted by a hydroxy group ay position 7.
hydroxycoumarinfluorescent probe;
food component;
plant metabolite
amentoflavonebiflavonoid;
hydroxyflavone;
ring assembly
angiogenesis inhibitor;
antiviral agent;
cathepsin B inhibitor;
P450 inhibitor;
plant metabolite
axillarinaxillarin : A dimethoxyflavone that is the 3,6-dimethyl ether derivative of quercetagetin.

axillarin: isolated from Pulicaria crispa or Filifdium sibiricum; structure given in first source
dimethoxyflavone;
tetrahydroxyflavone
plant metabolite
baicaleintrihydroxyflavoneangiogenesis inhibitor;
anti-inflammatory agent;
antibacterial agent;
anticoronaviral agent;
antifungal agent;
antineoplastic agent;
antioxidant;
apoptosis inducer;
EC 1.13.11.31 (arachidonate 12-lipoxygenase) inhibitor;
EC 1.13.11.33 (arachidonate 15-lipoxygenase) inhibitor;
EC 3.4.21.26 (prolyl oligopeptidase) inhibitor;
EC 3.4.22.69 (SARS coronavirus main proteinase) inhibitor;
EC 4.1.1.17 (ornithine decarboxylase) inhibitor;
ferroptosis inhibitor;
geroprotector;
hormone antagonist;
plant metabolite;
prostaglandin antagonist;
radical scavenger
chrysinchrysin : A dihydroxyflavone in which the two hydroxy groups are located at positions 5 and 7.7-hydroxyflavonol;
dihydroxyflavone
anti-inflammatory agent;
antineoplastic agent;
antioxidant;
EC 2.7.11.18 (myosin-light-chain kinase) inhibitor;
hepatoprotective agent;
plant metabolite
fisetin3'-hydroxyflavonoid;
7-hydroxyflavonol;
tetrahydroxyflavone
anti-inflammatory agent;
antioxidant;
EC 5.99.1.3 [DNA topoisomerase (ATP-hydrolysing)] inhibitor;
geroprotector;
metabolite;
plant metabolite
galangin5,7-dihydroxyflavonol: antimicrobial from the twigs of Populus nigra x Populus deltoides; structure in first source

galangin : A 7-hydroxyflavonol with additional hydroxy groups at positions 3 and 5 respectively; a growth inhibitor of breast tumor cells.
7-hydroxyflavonol;
trihydroxyflavone
antimicrobial agent;
EC 3.1.1.3 (triacylglycerol lipase) inhibitor;
plant metabolite
3-methylquercetinisorhamnetin : A monomethoxyflavone that is quercetin in which the hydroxy group at position 3' is replaced by a methoxy group.7-hydroxyflavonol;
monomethoxyflavone;
tetrahydroxyflavone
anticoagulant;
EC 1.14.18.1 (tyrosinase) inhibitor;
metabolite
norathyriolnorathyriol : A member of the class of xanthones that is 9H-xanthen-9-one substituted by hydroxy groups at positions 1, 3, 6 and 7. Isolated from Garcinia mangostana and Maclura pomifera, it exhibits inhibitory activity against protein kinase C.

norathyriol: from Gentinanaceae; has vasorelaxing action on rat thoracic aorta; structure given in first source
polyphenol;
xanthones
antineoplastic agent;
EC 2.7.11.13 (protein kinase C) inhibitor;
plant metabolite
morinmorin : A pentahydroxyflavone that is 7-hydroxyflavonol bearing three additional hydroxy substituents at positions 2' 4' and 5.

morin: a light yellowish pigment found in the wood of old fustic (Chlorophora tinctoria)
7-hydroxyflavonol;
pentahydroxyflavone
angiogenesis modulating agent;
anti-inflammatory agent;
antibacterial agent;
antihypertensive agent;
antineoplastic agent;
antioxidant;
EC 5.99.1.2 (DNA topoisomerase) inhibitor;
hepatoprotective agent;
metabolite;
neuroprotective agent
myricetin7-hydroxyflavonol;
hexahydroxyflavone
antineoplastic agent;
antioxidant;
cyclooxygenase 1 inhibitor;
food component;
geroprotector;
hypoglycemic agent;
plant metabolite
robinetinrobinetin : A pentahydroxyflavone that is flavone substituted by hydroxy groups at positions 3, 7, 3, 4' and 5'.

robinetin: structure given in first source
7-hydroxyflavonol;
pentahydroxyflavone
plant metabolite
santinsantin : A trimethoxyflavone that is flavone substituted by methoxy groups at positions 3, 6 and 4' and hydroxy groups at positions 5 and 7 respectively.

santin: from Tanacetum microphyllum; structure given in first source
dihydroxyflavone;
trimethoxyflavone
plant metabolite
scutellareinscutellarein : Flavone substituted with hydroxy groups at C-4', -5, -6 and -7.

scutellarein: aglycone of scutellarin from Scutellaria baicalensis; carthamidin is 2S isomer of scutellarein; do not confuse with isoscutellarein and/or isocarthamidin which are respective regioisomers, or with the scutelarin protein
tetrahydroxyflavonemetabolite
wogoninwogonin : A dihydroxy- and monomethoxy-flavone in which the hydroxy groups are positioned at C-5 and C-7 and the methoxy group is at C-8.

wogonin: structure in first source
dihydroxyflavone;
monomethoxyflavone
angiogenesis inhibitor;
antineoplastic agent;
cyclooxygenase 2 inhibitor;
plant metabolite
daidzein7-hydroxyisoflavonesantineoplastic agent;
EC 2.7.7.7 (DNA-directed DNA polymerase) inhibitor;
EC 3.2.1.20 (alpha-glucosidase) inhibitor;
phytoestrogen;
plant metabolite
7-hydroxyflavone7-hydroxyflavone : A hydroxyflavonoid in which the flavone nucleus is substituted at position 7 by a hydroxy group.hydroxyflavonoid
veronicastrosideluteolin 7-O-neohesperidoside : A disaccharide derivative that is luteolin substituted by a 2-O-(alpha-L-rhamnopyranosyl)-beta-D-glucopyranosyl moiety at position 7 via a glycosidic linkage.

veronicastroside: a flavonoid; second source Yak. Zas. shows same melting point, absorption, Rf and color tests for lonicerin (luteolin-7-rhamnoglucoside from Lonicera) and veronicastroside (luteolin-7-neohesperidoside from Trachelospermum);
disaccharide derivative;
glycosyloxyflavone;
neohesperidoside;
trihydroxyflavone
antibacterial agent;
metabolite
4-hydroxychalcone4-hydroxychalcone : A member of the class of chalcones that is trans-chalcone substituted by a hydroxy group at position 4.

4-hydroxychalcone: structure in first source
chalcones;
phenols
antihypertensive agent;
plant metabolite
3',4',7-trihydroxyisoflavone3',4',7-trihydroxyisoflavone : A 7-hydroxyisoflavone that is daidzein substituted by a hydroxy group at position 3'.

3',4',7-trihydroxyisoflavone: from Streptomyces sp OH-1049; structure given in first source
7-hydroxyisoflavonesantineoplastic agent;
EC 1.3.1.22 [3-oxo-5alpha-steroid 4-dehydrogenase (NADP(+))] inhibitor;
metabolite
6,7,4'-trihydroxyisoflavone4',6,7-trihydroxyisoflavone : A hydroxyisoflavone that is daidzein bearing an additional hydroxy substituent at position 6.

6,7,4'-trihydroxyisoflavone: structure in first source
7-hydroxyisoflavonesanti-inflammatory agent;
antimutagen;
EC 1.14.18.1 (tyrosinase) inhibitor;
metabolite;
PPARalpha agonist;
PPARgamma agonist
topiroxostatFYX-051: xanthine oxidoreductase inhibitor
cycloolivilcycloolivil: a free radical scavenger with platelet aggregation inhibitory activity; isolated from the olive treelignan
glyciteinglycitein : A methoxyisoflavone that is isoflavone substituted by a methoxy group at position 6 and hydroxy groups at positions 7 and 4'. It has been isolated from the mycelia of the fungus Cordyceps sinensis.7-hydroxyisoflavone;
methoxyisoflavone
fungal metabolite;
phytoestrogen;
plant metabolite
hypolaetin-8-glucosidehypolaetin-8-glucoside: isolated from Sideritis mugronensis; structure given in first source
kaempferol-3-o-rutinosidekaempferol-3-O-rutinoside: isolated from the methanolic extract of the whole plants of Diodia teres through repeated silica gel and Sephadex LH-20 column chromatography; structure in first source

kaempferol-3-rutinoside : A kaempferol O-glucoside that is kaempferol attached to a rutinosyl [6-deoxy-alpha-L-mannosyl-(1->6)-beta-D-glucosyl] residue at position 3 via a glycosidic linkage. It has been isolated from the leaves of Solanum campaniforme.
disaccharide derivative;
kaempferol O-glucoside;
rutinoside;
trihydroxyflavone
metabolite;
plant metabolite;
radical scavenger
4-methylesculetin4-methylesculetin: has antiinflammatory activity

6,7-dihydroxy-4-methylcoumarin : A hydroxycoumarin that is 4-methylcuomarin which is substituted by hydroxy groups at positions 3 and 4. A hyaluronan synthesis inhibitor. It has also been used as a fluorescent sensor to monitor the consumption of a boronic acid in Suzuki coupling reactions; fluorescence is readily detectable by the naked eye using a standard 365 nm UV lamp.
hydroxycoumarinanti-inflammatory agent;
antioxidant;
hyaluronan synthesis inhibitor
ombuineombuin : A dimethoxyflavone that is quercetin in which the hydroxy groups at positions 7 and 4' are replaced by methoxy groups. Isolated from Cyperus teneriffae, it exhibits anti-inflammatory activity.

ombuine: from rhizome of Alpinia tonkinensis
dimethoxyflavone;
flavonols;
trihydroxyflavone
anti-inflammatory agent;
plant metabolite
tilirosidetiliroside: isolated from seeds of Eremocarpus setigeruscinnamate ester;
glycosyloxyflavone;
monosaccharide derivative;
trihydroxyflavone
plant metabolite
4',5,7-trihydroxy-3,6-dimethoxyflavoneviscosine: a GABA-A receptor agonist with anxiolytic and anticonvulsant activities; isolated from Dodonaea viscosa; structure in first source
2-amino-6-chloropurine6-chloroguanine : An organochlorine compound that is 7H-purin-2-amine substituted by a chloro group at position 6.

6-chloroguanine: an antimalarial that inhibits hypoxanthine-guanine-xanthine phosphoribosyltransferase; structure in first source
2-aminopurines;
organochlorine compound
2',4'-dihydroxychalcone2',4'-dihydroxychalcone: RN given refers to (E)-isomer; RN for cpd without isomeric designation not available 6/89; structure given in first source
4',7,8-trihydroxyisoflavone4',7,8-trihydroxyisoflavone: from Streptomyces sp OH-1049; structure given in first sourceisoflavones
4,4'-dihydroxychalcone4,4'-dihydroxychalcone: structure
2,4,2'-trihydroxychalcone2,4,2'-trihydroxychalcone: structure in first source
broussochalcone abroussochalcone A: RN given for (E)-isomer; inhibits neutrophil respiratory burst; structure in first source
3-nitrobenzaldehyde isonicotinoylhydrazone3-nitrobenzaldehyde isonicotinoylhydrazone: structure in first source
fonsecinone afonsecinone A : A dimeric naphthopyran with formula C32H26O10, originally isolated from Aspergillus niger.

fonsecinone A: isolated from Aspergillus aculeatus; structure in first source
aromatic ether;
aromatic ketone;
biaryl;
cyclic ketone;
naphtho-gamma-pyrone;
polyphenol
antibacterial agent;
Aspergillus metabolite
sesone7-deazaxanthine: structure in first source
salvianolic acid csalvianolic acid C: mTOR inhibitor from Salvia miltiorrhizabenzofurans
4-hydroxycoumarin2-hydroxychromone: structurehydroxycoumarin
oxypurinolalloxanthine : A pyrazolopyrimidine that is 4,5,6,7-tetrahydro-H-pyrazolo[3,4-d]pyrimidine substituted by oxo groups at positions 4 and 6.

Oxypurinol: A xanthine oxidase inhibitor.
pyrazolopyrimidinedrug metabolite;
EC 1.17.3.2 (xanthine oxidase) inhibitor
allopurinolallopurinol : A bicyclic structure comprising a pyrazole ring fused to a hydroxy-substituted pyrimidine ring.

Allopurinol: A XANTHINE OXIDASE inhibitor that decreases URIC ACID production. It also acts as an antimetabolite on some simpler organisms.
nucleobase analogue;
organic heterobicyclic compound
antimetabolite;
EC 1.17.3.2 (xanthine oxidase) inhibitor;
gout suppressant;
radical scavenger
2-amino-4-hydroxy-6-formylpteridine2-amino-4-hydroxy-6-formylpteridine: pteridine precursor in biosynthesis of dihydropteroate; structure

6-formylpterin : Pterin carrying a formyl group at position 6.
aldehyde;
pterins
EC 1.17.3.2 (xanthine oxidase) inhibitor;
reactive oxygen species generator
bropiriminepyrimidines
9-phenylguanine