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'-Diaminobiphenyl-3,3'-disulfonic acid NSC3740 [1,1'-Biphenyl]-3,3'-disulfonic acid, 4,4'-diamino-