158076-64-3 2,2',3,3',4',5,5'-Heptachloro-4-biphenylol 4-Hydroxy-2,2',3,3',4',5,5'-heptachlorobiphenyl [1,1'-Biphenyl]-4-ol, 2,2',3,3',4',5,5'-heptachloro- (9CI) [1,1'-biphenyl]-4-ol, 2,2',3,3',4',5,5'-heptachloro-