(1,1'-Biphenyl)-3,3'-disulfonic acid, 4,4'-diamino- (9CI) 3,3'-Benzidinedisulfonic acid 3,3'-Biphenyldisulfonic acid, 4,4'-diamino- (8CI) 3365-90-0 4,4'-Diaminediphenyl-(1,1')-3,3'-disulfonic acid 4,4'-Diamino-(1,1'-biphenyl)-3,3'-disulfonic acid 4,4'-Diaminobiphenyl-3,3'-disulfonic acid NSC 3740