Benzene-1,2,4,5-tetrol
2,3,5,6-tetraamino-2,5-Cyclohexadiene-1,4-dione
9,10-dimethylanthracene-2,3,6,7-tetraol
9,10-dimethyl-9,10-dihydro-9,10-ethanoanthracene-2,3,6,7-tetrol (en)9,10-ethanoanthracene-2,3,6,7-tetrol, 9,10-dihydro-9,10-dimethyl- (en)