4-(phenylamino)benzenesulphonic acid, diphenylamine sulfonic acid, Diphenylaminosulfonic acid, Benzenesulfonic acid,4-(phenylamino), Benzenesulfonic acid,p-anilino, N-Phenyl-sulfanilsaeure, Diphenylamine-4-sulfonic acid, Benzenesulfonic acid, 4-(phenylamino)-, N-Phenyl-p-aminobenzenesulfonic acid, 4-Sulfodiphenylamine, p-Anilinobenzenesulfonic acid, 4-Anilino-benzol-sulfonsaeure-(1), diphenylamine-4-sulphonic acid, N-phenyl-sulfanilic acid