1,1'-Biphenyl, 2,2',3,4',5',6-hexachloro- 2,2',3',4,5,6'-Hexachlorobiphenyl 2,2',3,4',5',6-HEXACHLOROBIPHENYL 2,2',3,4',5',6-Hexachloro-1,1'-biphenyl 38380-04-0 PCB 149 PCB-149