1,1'-Biphenyl, 2,2',3,3',4,5',6,6'-octachloro- 2,2',3,3',4,5',6,6',-OCTACHLOROBIPHENYL 2,2',3,3',4,5',6,6'-Octachloro-1,1'-biphenyl 40186-71-8 PCB 201