1,1'-Biphenyl, 3,3',5,5'-tetrachloro- 3,3',5,5'-Tetrachlorobiphenyl 3,3',5,5'-Tetrachlorodiphenyl 3,5,3',5'-Tetrachlorobiphenyl 33284-52-5 Biphenyl, 3,3',5,5'-tetrachloro- NSC113288