What is "dihydroxyanthraquinone"

n. (context organic compound English) Any of several isomeric organic compounds with formula C₁₄H₈O₄, formally derived from an anthraquinone by replacing two hydrogen atoms by hydroxyl groups.

A dihydroxyanthraquinone is any of several isomeric organic compounds with formula , formally derived from 9,10-anthraquinone by replacing two hydrogen atoms by hydroxyl groups. Dihyroxyantraquinones have been studied since the early 1900s, and include some compounds of historical and current importance.

Wahl, Andre; Atack, F. W (1919) The Manufacture Of Organic Dyestuffs. G. Bell And Sons, Limited. Online version accessed on 2010-01-22.

Hugh Alister McGuigan (1921), An introduction to chemical pharmacology; pharmacodynamics in relation to chemistry. P. Blakiston's son, Philadelphia. Online version at archive.org, accessed on 2010-01-30.

The isomers differ in the position of the hydroxyl groups, and of the carbonyl oxygens (=O) of the underlying anthraquinone.