| Member | Definition | Role |
|---|
| 1,4-dihydroxyanthraquinone | A dihydroxyanthraquinone having the two hydroxy substituents at the 1- and 4-positions; formally derived from anthraquinone by replacement of two hydrogen atoms by hydroxy groups | quinizarin |
| 2,6-dihydroxyanthraquinone | A dihydroxyanthraquinone that is anthracene substituted by hydroxy groups at C-3 and C-7 and oxo groups at C-9 and C-10. | anthraflavic acid |
| alizarin | A dihydroxyanthraquinone that is anthracene-9,10-dione in which the two hydroxy groups are located at positions 1 and 2. | alizarin |
| aloe emodin | A dihydroxyanthraquinone that is chrysazin carrying a hydroxymethyl group at position 3. It has been isolated from plant species of the genus Aloe. | Aloe emodin |
| anthraglycoside b | | Emodin 8-glucoside |
| anthrarufin | A dihydroxyanthraquinone that is anthracene-9,10-dione substituted by hydroxy groups at positions 1 and 5. | anthrarufin |
| chrysophanic acid | A trihydroxyanthraquinone that is chrysazin with a methyl substituent at C-3. It has been isolated from Aloe vera and exhibits antiviral and anti-inflammatory activity. | chrysophanol |
| danthron | A dihydroxyanthraquinone that is anthracene-9,10-dione substituted by hydroxy groups at positions 1 and 8. | chrysazin |
| 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 |
| lucidin | | Lucidin |
| mitoxantrone | A dihydroxyanthraquinone that is 1,4-dihydroxy-9,10-anthraquinone which is substituted by 6-hydroxy-1,4-diazahexyl groups at positions 5 and 8. | mitoxantrone |
| obtusifolin | | Obtusifolin |
| physcione | A dihydroxyanthraquinone that is 9,10-anthraquinone bearing hydroxy substituents at positions 1 and 8, a methoxy group at position 3, and a methyl group at position 6. It has been widely isolated and characterised from both terrestrial and marine sources. | physcion |
| questin | A dihydroxyanthraquinone that is 1,6-dihyroxy-9,10-anthraquinone which is substituted by a methyl group at position 3 and a methoxy group at position 8. | questin |
| rhein | | Rhein |
| rubiadin | A dihydroxyanthraquinone that is anthracene-9,10-dione substituted by hydroxy groups at positions 1 and 3 and a methyl group at position 2. It has been isolated from Rubia yunnanensis. | rubiadin |
| soranjidiol | A member of the class of hydroxyanthraquinones that is anthracene-9,10-dione substituted by hydroxy groups at positions 1 and 6 and a methyl group at position 2. It has been isolated from the roots of Rubia yunnanensis. | 1,6-dihydroxy-2-methyl-9,10-anthraquinone |