Also Called: 2,2’,3,3’,5,5’,6-heptachlorobiphenyl;2,2',3,3',5,5',6-Heptachlorobiphenyl;PCB 178;Polychlorinated biphenyls (PCBs);1,1'-Biphenyl, 2,2',3,3',5,5',6-heptachloro-;1,2,4,5-tetrachloro-3-(2,3,5-trichlorophenyl)benzene;2,2',3,3',5,5',6-Heptachlorobiphenyl (PCB 178)