(1,1'-Biphenyl)-4,4'-diamine, 3,3'-dichloro- 3,3'-DICHLOROBENZIDINE 3,3'-Dichlorbenzidin [Czech] 3,3'-Dichloro-(1,1'-biphenyl)-4,4'-diamine 3,3'-Dichloro-4,4'-biphenyldiamine 3,3'-Dichloro-4,4'-diamino(1,1-biphenyl)