1-Naphthalenesulfonic acid, 3-((4-(acetylamino)phenyl)azo)-4-amino-5-hydroxy-, monosodium salt 69847-52-5 EINECS 274-154-4 N-((4-(4-Amino-5-hydroxy-1-sulfo-3-naphthyl)azo)phenyl)acetamide, sodium salt Sodium 3-((4-acetamidophenyl)azo)-4-amino-5-hydroxynaphthalene-1-sulphonate