3,3'-Dichlorobenzidine dihydrochloride 3,3'-Dichlorobenzidine hydrochloride 612-83-9 Benzidine, 3,3'-dichloro-, dihydrochloride NSC3524 WLN: ZR BG D- 2 &GH &GH [1,1'-Biphenyl]-4,4'-diamine, 3,3'-dichloro-, dihydrochloride