1,1'-Biphenyl, 4,4'-difluoro- (9CI) 398-23-2 4,4'-Difluorobiphenyl 4,4'-Difluorodiphenyl 4,4-DIFLUOROBIPHENYL AI3-19148 Biphenyl, 4,4'-difluoro- (8CI) EINECS 206-910-6 NSC 4173