117-61-3 2,2'-Benzidinedisulfonic acid 2,2'-Biphenyldisulfonic acid, 4,4'-diamino- 2,2'-Disulfobenzidine 4,4'-Biphenyldisulfonic acid, 2,2'-diamino- 4,4'-Diamino-2,2'-biphenyldisulfonic acid 4,4'-Diaminobiphenyl-2,2'-disulfonic acid 4,4'-Diaminodiphenyl-2,2'-disulfonic acid 6,6'-Bimetanilic acid Benzidine, 2,2'-disulfo- Benzidine-2,2'-disulfonic acid Kyselina benzidin-2,2'-disulfonova NSC3763 WLN: WSQR CZ F- 2 [1,1'-Biphenyl]-2,2'-disulfonic acid, 4,4'-diamino-