2,2',3,3',4,5',6'-Heptachlorobiphenyl;2,2',3,3',4',5,6-Heptachloro-1,1'-biphenyl; 2,2',3,3',4',5,6-Heptachlorobiphenyl;2,3,4,2',3',5',6'-Heptachlorobiphenyl; 2,3,5,6,2',3',4'-Heptachlorobiphenyl;PCB 177
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