Synonyms: disodium 3,3'-[carbonylbis[imino(5-methoxy-2-methyl-4,1-phenylene)azo]]bis[benzenesulphonate];3,3'(Ureylenesbis((5-methoxy-2-methyl-p-phenylene)azo))dibenzenesulfonic acid, disodium salt;Benzenesulfonic acid, 3,3'-(carbonylbis(imino(5-methoxy-2-methyl-4,1-phenylene)-2,1-diazenediyl))bis-, sodium salt (1:2);Benzenesulfonic acid, 3,3'-(carbonylbis(imino(5-methoxy-2-methyl-4,1-phenylene)azo))bis-, disodium salt;Einecs 267-530-4