Synonyms: Benzidine,3,3'-dichloro-, dihydrochloride (8CI); [1,1'-Biphenyl]-4,4'-diamine, 3,3'-dichloro-,dihydrochloride (9CI); 3,3'-Dichloro-4,4'-diaminobiphenyl dihydrochloride;3,3'-Dichloro[1,1'-biphenyl]-4,4'-diamine dihydrochloride;3,3'-Dichlorobenzidine dihydrochloride; Dichlodine H