Also Called: 2,2’,3,3’,4, 5’,6’-heptachlorobiphenyl;2,2',3,3',4, 5',6'-Heptachlorobiphenyl;PCB 177;2,2',3,3',4,5',6'-Heptachlorobiphenyl;Polychlorinated biphenyls (PCBs);1.1'-Biphenyl, 2,2',3,3',4,5',6'-heptachloro-;1,1'-Biphenyl, 2,2',3,3',4,5',6'-heptachloro-;1,2,4,5-tetrachloro-3-(2,3,4-trichlorophenyl)benzene