2-Naphthalenesulfonic acid, 7,7'-(carbonyldiimino)bis(3-((4-(acetylamino)phenyl)azo)-4-hydroxy-, disodium salt 41204-67-5 7,7'-Ureylene bis(3-((4-(acetylamino)phenyl)azo)-4-hydroxy-2-naphthalenesulfonic acid, disodium salt Disodium 7,7'-(carbonyldiimino)bis(3-((4-(acetylamino)phenyl)azo)-4-hydroxynaphthalene-2-sulphonate) EINECS 255-264-1