2,2',3,3',4',5,5'-Heptachloro-4-biphenylol;4-Hydroxy-2,2',3,3',4',5,5'-heptachlorobiphenyl; 4-OH-PCB 172; 4'-Hydroxy-2,2',3,3',4,5,5'-heptachlorobiphenyl;4'-Hydroxy-PCB 172
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