1-Naphthalenesulfonic acid, 4-(acetylamino)-5-hydroxy-6-((2,3,5-trichloro-6-hydroxyphenyl)azo)-, monosodium salt 3819-12-3 EINECS 223-313-6 Sodium 4-acetamido-5-hydroxy-6-((2,3,5-trichloro-6-hydroxyphenyl)azo)naphthalene-1-sulphonate