Synonyms: Benzidine,3,3'-dichloro- (7CI,8CI); 3,3'-Dichloro-4,4'-diaminobiphenyl;3,3'-Dichloro-p,p'-bianiline; 3,3'-Dichlorobenzidine;3,3'-Dichlorobiphenyl-4,4'-diamine; 4,4'-Diamino-3,3'-dichlorobiphenyl;4,4'-Diamino-3,3'-dichlorodiphenyl;4'-Amino-3,3'-dichloro[1,1'-biphenyl]-4-ylamine; C.I. 23060; Curithane C 126;NSC 154073; o,o'-Dichlorobenzidine