2-Naphthalenesulfonic acid, 7-((4-aminobenzoyl)amino)-4-hydroxy-3-((4-((4-sulfophenyl)azo)phenyl)azo)-, disodium salt 5938-85-2 Disodium 7-((4-aminobenzoyl)amino)-4-hydroxy-3-((4-((4-sulphonatophenyl)azo)phenyl)azo)naphthalene-2-sulphonate EINECS 227-697-6