2-Naphthalenesulfonic acid, 5-((4-(acetylamino)-2-((4-methylphenyl)sulfonyl)phenyl)azo)-6-amino-4-hydroxy-, monosodium salt 4404-39-1 EINECS 224-547-1 Sodium 5-((4-acetamido-2-((p-tolyl)sulphonyl)phenyl)azo)-6-amino-4-hydroxynaphthalene-2-sulphonate