A quinone in which the two oxo groups of the quinone are located para to each other on the 6-membered quinonoid ring.
| Member | Definition | Role |
|---|
| 1-hydroxyaklavinone | | (1R,2R,4S)-2-ethyl-2,4,5,7,10-pentahydroxy-6,11-dioxo-3,4-dihydro-1H-tetracene-1-carboxylic acid methyl ester |
| 2,5-di-tert-butylbenzoquinone | | 2,5-di-tert-Butyl-1,4-benzoquinone |
| 6-anilino-5,8-quinolinedione | A quinolone that is quinoline-5,8-dione in which the hydrogen at position 6 is replaced by an anilino group. | 6-anilino-5,8-quinolinedione |
| adriamycinol | A member of the class of tetracenequinones that is the major metabolite of the anthracycline doxorubicin, a chemotherapeutic agent effective against a broad range of malignant neoplasms. It is thought to exhibit cardiotoxic properties. | doxorubicinol |
| carubicin | A toxic anthracycline antibiotic that is produced by Actinomadura carminata and also has potent antineoplastic activity. | carminomycin |
| daunorubicin | A natural product found in Actinomadura roseola. | daunorubicin |
| dithianone | A naphthodithiin that is 5,10-dioxo-5,10-dihydronaphtho[2,3-b][1,4]dithiin which is substituted by nitrile groups at positions 2 and 3. It is a broad spectrum fungicide used to control scab, downy mildew, rust, and leaf spot in the commercial growing of grapes and other fruit, citrus, coffee, and vegetables. | dithianon |
| eleutherin | | Eleutherin |
| epirubicin | An anthracycline that is the 4'-epi-isomer of doxorubicin. | 4'-epidoxorubicin |
| frenolicin b | | frenolicin B |
| komaroviquinone | A tetracyclic diterpenoid isolated from Dracocephalum komarovii and has been shown to exhibit trypanocidal activity. | komaroviquinone |
| nanaomycin a | A pyranonaphthoquinone antibiotic from strain OS-3966 of Streptomyces rosa var. notoensis. | nanaomycin A |
| 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 |
| tetrangulol | A member of the class of tetraphenes that is tetraphene-7,12-dione substituted by hydroxy groups at positions 1 and 8 and a methyl group at position 3. | tetrangulol |
| topopyrone c | A naphthochromene that is 4H-naphtho[2,3-h]chromene-4,7,12-trione substituted by hydroxy groups at positions 5, 9 and 11 and a methyl group at position 2. It is isolated from fungal strains Phoma and Penicillium and acts as an inhibitor of the enzyme topoisomerase I. | topopyrone C |
| 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 |