2-Naphthalenesulfonic acid, 5-((4-(acetylamino)-2-((ethylphenylamino)sulfonyl)phenyl)azo)-6-amino-4-hydroxy-, monosodium salt 55470-66-1 6360-10-7 EINECS 228-824-8 Sodium 5-((4-(acetylamino)-2-((ethylphenylamino)sulphonyl)phenyl)azo)-6-amino-4-hydroxynaphthalene-2-sulphonate