1,1'-Biphenyl, 4,4'-dichloro- 2050-68-2 4,4'-Dichloro-1,1'-biphenyl 4,4'-Dichlorobiphenyl Biphenyl, 4,4'-dichloro- NSC1141 Polychlorobiphenyl p,p'-Dichlorobiphenyl p,p-DCBP