Synonyms: 2,2'-Biphenyldisulfonicacid, 4,4'-diamino- (6CI,7CI,8CI);2,2'-Benzidinedisulfonic acid;2,2'-Disulfo-4,4'-diaminobiphenyl;2,2'-Disulfobenzidine;4,4'-Diaminobiphenyl-2,2'-bis(sulfonic acid);4,4'-Diaminobiphenyl-2,2'-disulfonic acid;6,6'-Bimetanilic acid;NSC 3763;