[2,2'-Bianthra[2,1-d]thiazole]-6,6',11,11'-tetrone

Synthesis

2,2'-Bisanthra thiazole-6,11- quinonyl is prepared from 2-amino-1- chloroanthraquinone by replacing the chlorine atom by a mercapto group, followed by reaction with glyoxal sulfate in concentrated sulfuric acid .