3,3'(Ureylenesbis((5-methoxy-2-methyl-p-phenylene)azo))dibenzenesulfonic acid, disodium salt 67875-16-5 Benzenesulfonic acid, 3,3'-(carbonylbis(imino(5-methoxy-2-methyl-4,1-phenylene)azo))bis-, disodium salt Disodium 3,3'-(carbonylbis(imino(5-methoxy-2-methyl-4,1-phenylene)azo))bis(benzenesulphonate) EINECS 267-530-4