(1,1'-Biphenyl)-4-ol, 2,2',3,4',5,5',6-heptachloro- 158076-68-7 2,2',3,4',5,5',6-Heptachloro-(1,1'-biphenyl)-4-ol 4-Hydroxy-2,2',3,4',5,5',6-heptachlorobiphenyl