2-Naphthalenesulfonic acid, 6-amino-4-hydroxy-5-((2-((4-methylphenyl)sulfonyl)phenyl)azo)-, monosodium salt 71873-41-1 EINECS 276-117-8 Sodium 6-amino-4-hydroxy-5-((2-((p-tolyl)sulphonyl)phenyl)azo)naphthalene-2-sulphonate