Synonyms: sodium 8-anilino-5-[(2-chloro-4-nitrophenyl)azo]naphthalene-1-sulphonate;Acid Blue C;1-Naphthalenesulfonic acid, 5-[(2-chloro-4-nitrophenyl)azo]-8-(phenylamino)-, monosodium salt;1-Naphthalenesulfonic acid, 5-((2-chloro-4-nitrophenyl)azo)-8-phenylamino-, sodium salt;1-Naphthalenesulfonic acid, 5-(2-(2-chloro-4-nitrophenyl)diazenyl)-8-(phenylamino)-, sodium salt (1:1);1-Naphthalenesulfonic acid, 8-(phenylamino)-5-((2-chloro-4-nitrophenyl)azo)-, sodium salt;5-((2-Chloro-4-nitrophenyl)azo)-8-(phenylamino)-1-naphthalenesulfonic acid, sodium salt;8-Anilino-5-((2-chloro-4-nitrophenyl)azo)-1-naphthalenesulfonic acid, sodium salt