3-((4-Anilinophenyl)azo)benzenesulphonic acid 4-(Phenylamino)-3'-sulfoazobenzene 4005-68-9 587-98-4 Benzenesulfonic acid, 3-((4-(phenylamino)phenyl)azo)- Benzenesulfonic acid, m-(p-anilinophenylazo)- EINECS 223-658-2