2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-3-((4-((4-sulfophenyl)azo)phenyl)azo)-, disodium salt 6300-50-1 7-Amino-4-hydroxy-3-(4-(4-(sulfophenyl)azo)phenylazo)-2-naphthalenesulfonic acid, disodium salt Disodium 7-amino-4-hydroxy-3-((4-((4-sulphonatophenyl)azo)phenyl)azo)naphthalene-2-sulphonate EINECS 228-589-1 NSC 45594