(1,1'-Biphenyl)-2,2'-disulfonic acid, 4,4'-diamino- 117-61-3 2,2'-BIPHENYLDISULFONIC ACID, 4,4'-DIAMINO- 2,2'-Benzidinedisulfonic acid 2,2'-Disulfobenzidine 3-14-00-02264 (Beilstein Handbook Reference) 4,4'-Biphenyldisulfonic acid, 2,2'-diamino- 4,4'-Diamino-(1,1'-biphenyl)-2,2'-disulfonic acid 4,4'-Diaminobiphenyl-2,2'-disulfonic acid 4,4'-Diaminodiphenyl-2,2'-disulfonic acid 6,6'-Bimetanilic acid AI3-22051 BRN 2675524 Benzidine, 2,2'-disulfo- Benzidine-2,2'-disulphonic acid EINECS 204-200-0 Kyselina benzidin-2,2'-disulfonova [Czech] NSC 3763