A trihydroxyanthraquinone or trihydroxyanthracenedione is any of several isomeric organic compounds with formula (C12H5(OH)3)(CO)2, formally derived from anthraquinone by replacing three hydrogen atoms by hydroxyl groups.
They include several historically important dyes.
However, if the underlying core is symmetrical, some of these choices will give identical molecules.
Due to the symmetry of the 9,10-anthraquinone core, there are only 14 isomers.
[3] This article about an aromatic compound is a stub.