Also Called: Benzenesulfonic acid, 3,3'-[carbonylbis[imino(3- methoxy-4,1-phenylene)azo]]bis-, disodium salt;Benzenesulfonic acid, 3,3'-[carbonylbis[imino(3-methoxy-4,1-phenylene)azo]]bis-, disodium salt;Benzenesulfonic acid, 3,3'-[carbonylbis[imino(3-methoxy-4,1-phenylene)-2,1-diazenediyl]]bis-, sodium salt (1:2)