What is "tetrahydroxyanthraquinone"

n. (context organic compound English) Any of several isomeric organic compounds with formula C₁₄H₈O₆, usually derived from 9,10-anthraquinone by replacing four hydrogen atoms by hydroxyl groups.

A tetrahydroxyanthraquinone, also called tetrahydroxyanthradione, is any of several isomeric organic compounds with formula , almost invariably derived from 9,10- anthraquinone by replacing four hydrogen atoms by hydroxyl groups. Only a few of these isomers are commercially significant. These are 1,2,5,8-tetrahydroxyanthraquinone (quinalizarin), 1,4,5,8-tetrahydroxyanthraquinone, and 1,2,3,4-tetrahydroxyanthraquinone (Alizarine Bordeaux).