Members of the class of phenols that contain 2 or more benzene rings each of which is substituted by at least one hydroxy group.
| Member | Definition | Role |
|---|
| (-)-catechin-3-O-gallate | A gallate ester obtained by formal condensation of the carboxy group of gallic acid with the (3R)-hydroxy group of (-)-catechin. | (-)-catechin-3-O-gallate |
| (-)-gallocatechin gallate | A gallate ester obtained by formal condensation of the carboxy group of gallic acid with the (3R)-hydroxy group of (-)-gallocatechin. A natural product found in found in green tea. | (-)-gallocatechin gallate |
| (+)-epicatechin | A catechin that is flavan carrying five hydroxy substituents at positions 3, 3', 4', 5 and 7 (the 2S,3S-stereoisomer). | (+)-epicatechin |
| (+)-lyoniresinol-3-alpha-O-beta-D-glucopyranoside | A lignan that is (+)-lyoniresinol substituted by a beta-D-glucopyranosyl moiety at position 3 via a glycosidic linkage. Isolated from the root barks of Stemmadenia minima and Lycium chinense, it exhibits antimicrobial activities. | (+)-lyoniresinol-3-alpha-O-beta-D-glucopyranoside |
| (+)-trans-epsilon-viniferin | A stilbenoid that is the (+)-trans-stereoisomer of epsilon-viniferin, obtained by cyclodimerisation of trans-resveratrol. | (+)-trans-epsilon-viniferin |
| (E,E)-1-bromo-2,5-bis-(4-hydroxystyryl)benzene | An organobromine compound that is bromobenzene in which the hydrogens at positions 2 and 5 are replaced by 4-hydroxystyryl groups. | (E,E)-1-bromo-2,5-bis-(4-hydroxystyryl)benzene |
| 1,2,8-trihydroxy-6-methoxyxanthone | A member of the class of xanthones that is 9H-xanthen-9-one substituted by hydroxy groups at positions 1, 2 and 8 and a methoxy group at position 6. It has been isolated from various species of the genus Swertia and has been found to exhibit antioxidant activities. | swertianin |
| 1,8-dihydroxy-3,7-dimethoxyxanthone | A member of the class of xanthones that is swertianin in which the hydroxy group at position 2 has been replaced by a methoxy group. | 2-O-methylswertianin |
| 2,3,6,8-tetrahydroxy-1-(3-methylbut-2-enyl)-5-(2-methylbut-3-en-2-yl)-9h-xanthen-9-one | A member of the class of xanthones that is 9H-xanthen-9-one substituted by hydroxy groups at positions 2, 3, 6 and 8, an isoprenyl group at position 1 and a 2-methylbut-3-en-2-yl group at position 5. It is isolated from the root barks of Cudrania tricuspidata and exhibits cytotoxicity towards human cancer cell lines. | cudratricusxanthone A |
| 2',6'-dihydroxy-4'-methoxydihydrochalcone | A member of the class of dihydrochalcones that is dihydrochalcone substituted by hydroxy groups at positions 2' and 6' and a methoxy group at position 4' respectively. | 2',6'-dihydroxy-4'-methoxydihydrochalcone |
| 3,3',4,5'-tetrahydroxystilbene | A stilbenol that is trans-stilbene in which one of the phenyl groups is substituted by hydroxy groups at positions 3 and 4, while the other phenyl group is substituted by hydroxy groups at positions 3 and 5. | piceatannol |
| 4-hydroxycordoin | A member of the class of chalcones that is trans-chalcone substituted by hydroxy groups at position 4 and 2' and a (3-methylbut-2-en-1-yl)oxy group at position 4'. It has been isolated from Lonchocarpus neuroscapha. | 4-hydroxycordoin |
| 4',7-dihydroxyflavanone | A dihydroxyflavanone in which the two hydroxy substituents are located at positions 4' and 7. | 4',7-dihydroxyflavanone |
| 5,11-diethyl-5,6,11,12-tetrahydrochrysene-2,8-diol | A carbotetracyclic compound that is 5,6,11,12-tetrahydrochrysene substituted by hydroxy groups at positions 2 and 8 and by ethyl groups at positions 5 and 11 (the 5R,11R-stereoisomer). It is an agonist of ER-alpha and antagonist of ER-beta receptors. | (R,R)-5,11-diethyl-5,6,11,12-tetrahydro-2,8-chrysenediol |
| 5,7-dihydroxy-3-(3-hydroxy-4-methoxybenzyl)-6-methoxychroman-4-one | A homoisoflavonoid that is 2,3-dihydro-4H-chromen-4-onethat is substituted by hydroxy groups at positions 5 and 7, a methoxy group at position 6, and a 3-hydroxy-4-methoxybenzyl group at position 3. It has been isolated from various plants, including the bulb of Cremastra appendiculata. | cremastranone |
| 9,9-bis(4-hydroxyphenyl)fluorene | A member of the class of fluorenes that is 9H-fluorene in which both of the hydrogens at position 9 have been replaced by p-hydroxyphenyl groups. | 9,9-bis(4-hydroxyphenyl)fluorene |
| acrovestone | A polyphenol that is isolated from Acronychia pedunculata and exhibits moderate antioxidant and antityrosinase activities. | acrovestone |
| acteoside | A glycoside that is the alpha-L-rhamnosyl-(1->3)-beta-D-glucoside of hydroxytyrosol in which the hydroxy group at position 4 of the glucopyranosyl moiety has undergone esterification by formal condensation with trans-caffeic acid. | acteoside |
| adefovir | A dimeric naphthopyran with formula C32H26O10, originally isolated from Aspergillus niger. | aurasperone A |
| aglucovancomycin b | A peptide antibiotic that is vancomycin lacking the disaccharide moiety. | vancomycin aglycone zwitterion; vancomycin aglycone |
| alteichin | | Alteichin |
| altenusin | A carboxybiphenyl that is [biphenyl]-2-carboxylic acid which is substituted by a hydroxy group at positions 3, 4' and 5', methoxy group at position 5 and a methyl group at position 2'. It is a a metabolite isolated from Alternaria and several other fungal species. | altenusin |
| aspalathin | A member of the class of dihydrochalcones that is the 2-C-beta-D-glucopyranide of phloroglucinol and which is substituted at position 4 by a 3-(3,4-dihydroxyphenyl)propanoyl group. A metabolite of red bush, Aspalathus linearis (and present in the herbal tea made from the leaves), aspalathin exhibits significant hypoglycemic activity. | aspalathin |
| astringin | A stilbenoid that is piceatannol substituted at position 3 by a beta-D-glucosyl residue. | trans-astringin |
| atromentin | A member of the class of dihydroxy-1,4-benzoquinones that is 2,5-dihydroxycyclohexa-2,5-diene-1,4-dione which is substituted by a 4-hydroxyphenyl group at positions 3 and 6. It is a mushroom pigment isolated from several fungi species and acts as a smooth muscle stimulant, and exhibits anticoagulant, antibacterial and antineoplastic properties. | atromentin |
| averufin | An organic heteropentacyclic compound that is 3,4,5,6-tetrahydro-2H-2,6-epoxyanthra[2,3-b]oxocine-8,13-dione substituted at position 2 by a methyl group and at positions 7, 9 and 11 by hydroxy groups (the S,S-diastereomer) | (1'S,5'S)-averufin |
| bellidifolin | A member of the xanthone family that is bellidin substituted with a methyl group at O-3. A natural product found particularly in Swertia chirata and Gentianella campestris. | bellidifolin |
| benanomicin b | A member of the class of pradimicins that is isolated from the cultured broth of Actinomadura hibisca No. P157-2 (ATCC 53557). | pradimicin C |
| bisdemethoxycurcumin | A beta-diketone that is methane in which two of the hydrogens are substituted by 4-hydroxycinnamoyl groups. | bisdemethoxycurcumin |
| bithionol | An aryl sulfide that is diphenyl sulfide in which each phenyl group is substituted at position 2 by hydroxy and at positions 3 and 5 by chlorine. A fungicide and anthelmintic, it was used in various topical drug products for the treatment of liver flukes, but withdrawn after being shown to be a potent photosensitizer with the potential to cause serious skin disorders. | bithionol |
| bromcresol purple | A member of the class of 2,1-benzoxathioles that is 2,1-benzoxathiole 1,1-dioxide in which both of the hydrogens at position 3 have been substituted by 3-bromo-4-hydroxy-5-methylphenyl groups. A hydrophilic dye that is used as a pH indicator and to measure serum albumin concentrations. | bromocresol purple |
| bromthymol blue | A member of the class of 2,1-benzoxathioles that is 2,1-benzoxathiole 1,1-dioxide in which both of the hydrogens at position 3 have been substituted by 3-bromo-4-hydroxy-5-isopropyl-2-methylphenyl groups. | bromothymol blue |
| butein | A chalcone that is (E)-chalcone bearing four additional hydroxy substituents at positions 2', 3, 4 and 4'. | butein |
| catechin gallate | A gallate ester obtained by formal condensation of the carboxy group of gallic acid with the (3S)-hydroxy group of (+)-catechin. | (+)-catechin-3-O-gallate |
| cercosporamide | A member of the class of dibenzofurans that is a potent broad spectrum antifungal agent isolated from the fungus Cercosporidium henningsii. | cercosporamide |
| chloroorienticin b | A glycopeptide that is isolated from Amycolatopsis orientalis. | chloroorienticin B |
| complestatin | A heterodetic cyclic peptide consisting of N-acylated trytophan, 3,5-dichloro-4-hydroxyphenylglycine, 4-hydroxyphenylglycine, 3,5-dichloro-4-hydroxyphenylglycyl, tyrosine and 4-hydroxyphenylglycine residues joined in sequence and in which the side-chain of the central 4-hydroxyphenylglycine residue is attached to the side-chain of the tryptophan via a C3-C6 bond and to the side-chain of the tyrosine via an ether bond from C5. It is isolated from the culture broth of Streptomyces and has anti-HIV-1 activity. | chloropeptin II; isocomplestatin |
| complestatin | A heterodetic cyclic peptide which is a atropisomer of complestatin. It is isolated from the culture broth of Streptomyces and has anti-HIV-1 activity. | chloropeptin II; isocomplestatin |
| corytuberine | An aporphine alkaloid that is aporphine which is substituted by hydroxy groups at positions 1 and 11, and by methoxy groups at positions 2 and 10 (the S enantiomer). | (S)-corytuberine |
| coumestrol | A member of the class of coumestans that is coumestan with hydroxy substituents at positions 3 and 9. | coumestrol |
| cresol red | A member of the class of 2,1-benzoxathioles that is 2,1-benzoxathiole 1,1-dioxide in which both of the hydrogens at position 3 have been substituted by 4-hydroxy-5-methylphenyl groups. | cresol red |
| curcumin | A beta-diketone that is methane in which two of the hydrogens are substituted by feruloyl groups. A natural dyestuff found in the root of Curcuma longa. | curcumin |
| davidigenin | A member of the class of dihydrochalcones that is dihydrochalcone substituted by hydroxy groups at positions 4, 2', and 4' respectively. | davidigenin |
| delta-viniferin | A stilbenoid that is the (2S,3S)-trans-stereoisomer of delta-viniferin, obtained by cyclodimerisation of trans-resveratrol. | (2S,3S)-trans-delta-viniferin |
| demethoxycurcumin | A beta-diketone that is curcumin in which one of the methoxy groups is replaced by hydrogen. It is found in Curcuma zedoaria and Etlingera elatior. | demethoxycurcumin |
| diethylstilbestrol | An olefinic compound that is trans-hex-3-ene in which the hydrogens at positions 3 and 4 have been replaced by p-hydroxyphenyl groups. | diethylstilbestrol |
| dihydroxanthohumol | A member of the class of dihydrochalcones that is the alpha,beta-dihydro derivative of xanthohumol. Isolated from Humulus lupulus, it exhibits inhibition of NO production. | dihydroxanthohumol |
| du-21220 | A secondary amino compound that is 4-(2-amino-1-hydroxypropyl)phenol in which one of the hydrogens attached to the nitrogen is replaced by a 2-(4-hydroxyphenyl)ethyl group. | 4-[2-[[1-hydroxy-1-(4-hydroxyphenyl)propan-2-yl]amino]ethyl]phenol |
| ecteinascidin 743 | A tetrahydroisoquinoline alkaloid obtained from a Caribbean tunicate Ecteinascidia turbinata. Used for the treatment of soft tissue sarcoma and relapsed ovarian cancer. | trabectedin |
| ellagic acid | An organic heterotetracyclic compound resulting from the formal dimerisation of gallic acid by oxidative aromatic coupling with intramolecular lactonisation of both carboxylic acid groups of the resulting biaryl. It is found in many fruits and vegetables, including raspberries, strawberries, cranberries, and pomegranates. | ellagic acid |
| enterobactin | A macrotriolide produced by certain members of Enterobacteriaceae, e.g. Escherichia coli and Salmonella. | enterobactin |
| epicatechin | A catechin with (2R,3R)-configuration. | (-)-epicatechin |
| epicatechin gallate | A gallate ester obtained by formal condensation of the carboxy group of gallic acid with the (3R)-hydroxy group of epicatechin. A natural product found in Parapiptadenia rigida. | (-)-epicatechin-3-O-gallate |
| epigallocatechin gallate | A gallate ester obtained by the formal condensation of gallic acid with the (3R)-hydroxy group of (-)-epigallocatechin. | (-)-epigallocatechin 3-gallate |
| epsilon-viniferin | A stilbenoid that is the (-)-trans-stereoisomer of epsilon-viniferin, obtained by cyclodimerisation of trans-resveratrol. | (-)-trans-epsilon-viniferin |
| eupatorin | A trimethoxyflavone that is 6-hydroxyluteolin in which the phenolic hydogens at positions 4', 6 and 7 have been replaced by methyl groups. | eupatorin |
| fentichlor | An aryl sulfide having two 5-chloro-2-hydroxyphenyl groups attached to sulfur; an antiinfective drug mostly used in veterinary medicine. | fenticlor |
| fluorescein | A xanthene dye that is highly fluorescent, detectable even when present in minute quantities. Used forensically to detect traces of blood, in analytical chemistry as an indicator in silver nitrate titrations and in microscopy. | fluorescein (lactone form) |
| fonsecinone a | A dimeric naphthopyran with formula C32H26O10, originally isolated from Aspergillus niger. | fonsecinone A |
| fumimycin | A member of the class of 1-benzofurans that is 1-benzofuran-2(3H)-one substituted by a propenyl group at position 4, hydroxy groups at positions 5 and 6, methyl group at position 3 and a [(2E)-3-carboxyprop-2-enoyl]nitrilo group at position 3. Isolated from the fermentation broth of Aspergillus fumisynnematus F746, it exhibits antibacterial activity. | fumimycin |
| gallein | A xanthene dye that is fluoran carrying four hydroxy substituents at positions 3', 4', 5' and 6'. | gallein |
| gallocatechin-3-gallate | A gallate ester obtained by formal condensation of the carboxy group of gallic acid with the (3S)-hydroxy group of (+)-gallocatechin. | (+)-gallocatechin gallate |
| gartanin | A member of the class of xanthones that is 9H-xanthen-9-one substituted by hydroxy groups at positions 1, 3, 5 and 8 and prenyl groups at positions 2 and 4. | gartanin |
| gentiacaulein | A member of the class of xanthones that is 9H-xanthen-9-one substituted by hydroxy groups at positions 2 and 8 and methoxy groups at positions 1 and 6. | gentiacaulein |
| gentisein | A member of the class of xanthones that is 9H-xanthen-9-one substituted by hydroxy groups at positions 1, 3 and 7. | gentisein |
| gentisin | A member of the class of xanthones that is 9H-xanthen-9-one substituted by hydroxy groups at positions 1 and 7 and a methoxy group at position 3. | gentisin |
| hematoxylin | An organic heterotetracyclic compound 7,11b-dihydroindeno[2,1-c]chromene carrying five hydroxy substituents at positions 3, 4, 6a, 9 and 10. The most important and most used dye in histology, histochemistry, histopathology and in cytology. | haematoxylin |
| hetacillin | A lignan that consists of tetrahydrofuran substituted by a 3,4-dihydroxyphenyl group at position 2, a hydroxymethyl group at position 3 and a 4-hydroxy-3-methoxybenzyl group at position 4. It has been isolated from Taxus yunnanensis. | taxiresinol |
| hexachlorophene | An organochlorine compound that is diphenylmethane in which each of the phenyl groups is substituted by chlorines at positions 2, 3, and 5, and by a hydroxy group at position 6. An antiseptic that is effective against Gram-positive organisms, it is used in soaps and creams for the treatment of various skin disorders. It is also used in agriculture as an acaricide and fungicide, but is not approved for such use within the European Union. | hexachlorophene |
| hydrazinocurcumin | A pyrazole obtained by cyclocodensation of the two carbonyl groups of curcumin with hydrazine. | hydrazinocurcumin |
| isobavachalcone | A member of the class of chalcones that is trans-chalcone substituted by hydroxy groups at positions 4, 2' and 4' and a prenyl group at position 3'. | isobavachalcone |
| isogentisin | A member of the class of xanthones that is 9H-xanthen-9-one substituted by hydroxy groups at positions 1 and 3 and a methoxy group at position 7. | isogentisin |
| isolariciresinol | A lignan that is 5,6,7,8-tetrahydronaphthalen-2-ol substituted by hydroxymethyl groups at positions 6 and 7, a methoxy group at position 3 and a 4-hydroxy-3-methoxyphenyl group at position 8. It has been isolated from the roots of Rubia yunnanensis. | (+)-isolariciresinol |
| isomangiferin | A member of the class of xanthones that is 9H-xanthen-9-one substituted by hydroxy groups at positions 1, 3, 6 and 7 and a 1,5-anhydro-D-glucitol moiety at position 1. | isomangiferin |
| knipholone | An anthraquinone that is anthracene-9,10-dione substituted by hydroxy groups at positions 4 and 6, a methyl group at position 2 and a 3-acetyl-2,6-dihydroxy-4-methoxyphenyl group at position 1. It exhibits antioxidant, cytotoxic and antiplasmodial activities. | knipholone |
| lespenefril | A glycosyloxyflavone that is kaempferol attached to alpha-L-rhamnopyranosyl residues at positions 3 and 7 respectively via glycosidic linkages. It has been isolated from the aerial parts of Vicia faba and Lotus edulis. | kaempferol 3,7-di-O-alpha-L-rhamnoside |
| liphagal | A meroterpenoid isolated from the marine sponge Aka coralliphaga and has been shown to exhibit inhibitory activity against phosphatidylinositol-3-OH kinase. | liphagal |
| lyoniresinol | A lignan that is tetralin substituted by a 4-hydroxy-3,5-dimethoxy group at position 4, hydroxymethyl groups at positions 2 and 3, methoxy groups at positions 5 and 7 and a hydroxy group at position 6. Isolated from Machilus robusta and Sinocalamus affinis, it exhibits antineoplastic activity. | (+)-lyoniresinol |
| marsupsin | A member of the class of 1-benzofurans that is 1-benzofuran-3(2H)-one, substituted by hydroxy groups at positions 2 and 6, a 4-hydroxybenzyl group at position 2 and a methoxy group at position 4. Isolated from the heartwood of Pterocarpus marsupium, it exhibits antihyperglycemic and antihyperlipidemic activities. | marsupsin |
| matairesinol | A lignan that is gamma-butyrolactone in which the 3 and 4 positions are substituted by 4-hydroxy-3-methoxybenzyl groups (the 3R,4R-diastereomer). | (-)-matairesinol |
| medioresinol | A lignan that is tetrahydro-1H,3H-furo[3,4-c]furan substituted by a 4-hydroxy-3,5-dimethoxyphenyl group at position 1 and a 4-hydroxy-3-methoxyphenyl group at position 4. It has been isolated from the stems of Sinocalamus affinis. | (-)-medioresinol |
| mycocyclosin | An organic heterotetracyclic compound obtained via intramolecular oxidative aromatic coupling of cyclo(L-tyrosyl-L-tyrosyl). | mycocyclosin |
| naringenin chalcone | A member of the class of chalcones that is trans-chalcone substituted by hydroxy groups at positions 2' ,4, 4', and 6' respectively. | 2',4,4',6'-tetrahydroxychalcone |
| neoglycyrol | A member of the class of coumestans that is coumestan substituted by hydroxy groups at positions 1 and 9, a methoxy group at position 3 and a prenyl group at position 2 respectively. | glycyrol |
| neuroprotectin a | A heterodetic cyclic peptide that is chloropeptin II in which the indole moiety is oxidised to the corresponding 2-oxindole. It is a HIV-1 integrase inhibitor isolated from Streptomyces. | complestatin A |
| norathyriol | 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 |
| norbelladine | A phenethylamine alkaloid that is tyramine in which one of the amino hydrogens has been replaced by a 3,4-dihydroxybenzyl group. | norbelladine |
| norlichexanthone | A member of the class of xanthones that is 9H-xanthen-9-one substituted by hydroxy groups at positions 1, 3 and 6 and a methyl group at position 8. It has been isolated from Wardomyces anomalus. | norlichexanthone |
| pallidol | A tetracyclic stilbenoid that is a homodimer obtained by cyclodimerisation of resveratrol. | pallidol |
| polydatin | A stilbenoid that is trans-resveratrol substituted at position 3 by a beta-D-glucosyl residue. | trans-piceid |
| pradimicin a | A member of the class of pradimicins that is isolated from the cultured broth of Actinomadura hibisca No. P157-2 (ATCC 53557). | pradimicin A |
| pradimicin b | A member of the class of prodimicins that is isolated from the cultured broth of Actinomadura hibisca No. P157-2 (ATCC 53557). | pradimicin B |
| probucol | A dithioketal that is propane-2,2-dithiol in which the hydrogens attached to both sulfur atoms are replaced by 3,5-di-tert-butyl-4-hydroxyphenyl groups. An anticholesteremic drug with antioxidant and anti-inflammatory properties, it is used to treat high levels of cholesterol in blood. | probucol |
| procyanidin b1 | A proanthocyanidin consisting of (-)-epicatechin and (+)-catechin units joined by a bond between positions 4 and 8' respectively in a beta-configuration.. Procyanidin B1 can be found in Cinnamomum verum (Ceylon cinnamon, in the rind, bark or cortex), in Uncaria guianensis (cat's claw, in the root), and in Vitis vinifera (common grape vine, in the leaf) or in peach. | procyanidin B1 |
| procyanidin b2 | A proanthocyanidin consisting of two molecules of (-)-epicatechin joined by a bond between positions 4 and 8' in a beta-configuration. Procyanidin B2 can be found in Cinchona pubescens (Chinchona, in the rind, bark and cortex), in Cinnamomum verum (Ceylon cinnamon, in the rind, bark and cortex), in Crataegus monogyna (Common hawthorn, in the flower and blossom), in Uncaria guianensis (Cat's claw, in the root), in Vitis vinifera (Common grape vine, in the leaf), in Litchi chinensis (litchi, in the pericarp), in the apple, in Ecdysanthera utilis and in red wine. | procyanidin B2 |
| procyanidin b3 | A proanthocyanidin consisting of two molecules of (+)-catechin joined by a bond between positions 4 and 8' in alpha-configuration. It can be found in red wine, in barley, in beer, in peach or in Jatropha macrantha, the Huanarpo Macho. | procyanidin B3 |
| procyanidin b5 | A proanthocyanidin consisting of two molecules of (-)-epicatechin joined by a bond between positions 4 and 6' in beta-configuration. It can be found in grape seeds, in Hibiscus cannabinus (kenaf) root and bark, in apple and in cacao. | procyanidin B5 |
| procyanidin C1 | A proanthocyanidin consisting of three (-)-epicatechin units joined by two successive (4beta->8)-linkages. | procyanidin C1 |
| psoralidin | A member of the class of coumestans that is coumestan substituted by hydroxy groups at positions 3 and 9 and a prenyl group at position 2 respectively. | psoralidin |
| quadrangularin a | An indane-derived stilbenoid that is a homodimer obtained by cyclodimerisation of resveratrol. | quadrangularin A |
| ractopamine | A secondary amino compound that is 4-(2-amino-1-hydroxyethyl)phenol in which one of the hydrogens attached to the nitrogen is replaced by a 4-(p-hydroxyphenyl)butan-2-yl group. | 4-(1-hydroxy-2-{[4-(4-hydroxyphenyl)butan-2-yl]amino}ethyl)phenol |
| resveratrol | A stilbenol that is stilbene in which the phenyl groups are substituted at positions 3, 5, and 4' by hydroxy groups. | resveratrol |
| rhodomycinone | A carboxylic ester that is the methyl ester of (1R,2R,4S)-2-ethyl-2,4,5,7,12-pentahydroxy-6,11-dioxo-1,2,3,4,6,11-hexahydrotetracene-1-carboxylic acid. | epsilon-rhodomycinone |
| rifamycin sv | A member of the class of rifamycins that exhibits antibiotic and antitubercular properties. | rifamycin SV |
| rosmarinic acid | The 1-carboxy-2-(2,4-dihydroxyphenyl)ethyl ester of trans-caffeic acid. | rosmarinic acid |
| rubraxanthone | A member of the class of xanthones that is 9H-xanthen-9-one substituted by hydroxy groups at positions 3, 6 and 8, a geranyl group at position 1 and a methoxy group at position 2. Isolated from Mesua and Garcinia dioica, it exhibits antibacterial and cytotoxic activities. | rubraxanthone |
| salvianolic acid B | A member of the class of 1-benzofurans that is an antioxidant and free radical scavenging compound extracted from S. miltiorrhiza | salvianolic acid B |
| scytonemin | A ring assembly obtained by 1,1'-coupling of two molecules of (3E)-3-[(4-hydroxyphenyl)methylidene]cyclopenta[b]indol-2(3H)-one. A UV-screening molecule produced by many strains of cyanobacteria. | scytonemin |
| silybin | A flavonolignan isolated from milk thistle, Silybum marianum, that has been shown to exhibit antioxidant and antineoplastic activities. | silibinin |
| silychristin | A flavonolignan isolated from Silybum marianum and has been shown to exhibit inhibitory activities against lipoxygenase and prostaglandin synthetase. | silychristin |
| swertisin | A flavone C-glycoside that is 7-O-methylapigenin in which the hydrogen at position 6 has been replaced by a beta-D-glucosyl residue. | swertisin |
| syringaresinol | A lignan that is 7,9':7',9-diepoxylignane substituted by hydroxy groups at positions 4 and 4' and methoxy groups at positions 3, 3', 5 and 5' respectively. | syringaresinol |
| tetrahydrocurcumin | A beta-diketone that is curcumin in which both of the double bonds have been reduced to single bonds. | tetrahydrocurcumin |
| tetrahydroxycurcumin | A beta-diketone that is curcumin in which the two methoxy groups have been replaced by hydroxy groups. It is a metabolite of curcumin. | tetrahydroxycurcumin |
| tricin 4'-o-(threo-beta-guaiacylglyceryl) ether | A flavonolignan isolated from the stems of Sinocalamus affinis. | (-)-(7''S,8''S)-4'',5,7-trihydroxy-3',3'',5'-trimethoxy-4',8''-oxyflavonolignan-7'',9''-diol |
| usnic acid | A member of the class of dibenzofurans that is dibenzo[b,d]furan-1(9bH)-one substituted by acetyl groups at positions 2 and 6, hydroxy groups at positions 3 and 7 and methyl groups at positions 8 and 9b. | usnic acid |
| versicolorin a | An organic heteropentacyclic compound that is 3a,12a-dihydroanthra[2,3-b]furo[3,2-d]furan-5,10-dione carrying three hydroxy substituents at positions 4, 6 and 8. | versicolorin A |
| versicolorin c | An organic heteropentacyclic compound that is 2,3,3a,12a-tetrahydroanthra[2,3-b]furo[3,2-d]furan-5,10-dione carrying three hydroxy substituents at positions 4, 6 and 8. | versicolorin B |
| versiconal hemiacetal acetate | An anthrafuran that is 2,3-dihydroanthra[2,3-b]furan-5,10-dione substituted at positions 2, 4, 6 and 8 by hydroxy groups and at position 3 by a 2-acetoxyethyl group. An intermediate in the biosynthesis of aflatoxin. | versiconal hemiacetal acetate |
| wedelolactone | A member of the class of coumestans that is coumestan with hydroxy substituents as positions 1, 8 and 9 and a methoxy substituent at position 3. | wedelolactone |
| xanthohumol | A member of the class of chalcones that is trans-chalcone substituted by hydroxy groups at positions 4, 2' and 4', a methoxy group at position 6' and a prenyl group at position 3'. Isolated from Humulus lupulus, it induces apoptosis in human malignant glioblastoma cells. | xanthohumol |