Synonyms: 3,3'-Biphenyldicarboxylicacid, 4,4'-diamino- (7CI,8CI); 3,3'-Benzidinedicarboxylic acid; 3,3'-Dicarboxy-4,4'-diaminobiphenyl;3,3'-Dicarboxybenzidine; 4,4'-Diamino-3,3'-biphenyldicarboxylic acid;5,5'-Bianthranilic acid; 5,5'-Dianthranilic acid; Benzidine-m,m'-dicarboxylicacid