4,4'-Carbonylbis(imino(5-methoxy-2-methyl-4,1-phenylene)azo))bisbenzenesulfonic acid, salt with 2,2',2''-nitrilotriethanol 72102-83-1 Benzenesulfonic acid, 4,4'-(carbonylbis(imino(5-methoxy-2-methyl-4,1-phenylene)azo))bis-, compd. with 2,2',2''-nitrilotris(ethanol) (1:2)