1H-Naphth[1,2-d]imidazole-7-sulfonicacid,1-[(2-chlorophenyl)amino]-9-hydroxy-2-methyl-,monosodium salt (9CI), EINECS 288-762-2, 1H-Naphth[1,2-d]imidazole-7-sulfonicacid,1-[(2-chlorophenyl)amino]-9-hydroxy-2-methyl-,sodium salt (1:1), Sodium 1-(2-chloroanilino)-9-hydroxy-2-methylnaphth(1,2-d)imidazole-7-sulphonate,