2-Naphthalenesulfonic acid, 6-amino-4-hydroxy-5-((2-(phenylsulfonyl)phenyl)azo)-, monosodium salt 39280-62-1 6245-60-9 EINECS 228-359-0 Sodium 6-amino-4-hydroxy-5-((2-(phenylsulphonyl)phenyl)azo)naphthalene-2-sulphonate