3, 3'-Benzidinedisulfonic acid 3,3'-Biphenyldisulfonic acid, 4, 4'-diamino- 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 AIDS-123969 AIDS123969 NSC3740 {[1,1'-Biphenyl]-3,3'-disulfonic} acid, 4,4'-diamino-