2-Naphthalenesulfonic acid, 8-((4-(acetylamino)phenyl)azo)-5-((4-amino-7-sulfo-1-naphthalenyl)azo)-, disodium salt 68540-97-6 Disodium 8-((4-acetamidophenyl)azo)-5-((4-amino-7-sulphonatonaphthyl)azo)naphthalene-2-sulphonate EINECS 271-330-2