2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-3-((5-hydroxy-6-(phenylazo)-7-sulfo-2-naphthalenyl)azo)-, disodium salt 6227-02-7 Disodium 7-amino-4-hydroxy-3-((5-hydroxy-6-(phenylazo)-7-sulphonato-2-naphthyl)azo)naphthalene-2-sulphonate EINECS 228-323-4