1,1'-Biphenyl, 2,2',6,6'-tetrachloro- 15968-05-5 2,2',6,6'-TETRACHLOROBIPHENYL 2,2',6,6'-Tetrachloro-1,1'-biphenyl 2,6,2',6'-Tetrachlorobiphenyl 3-05-00-01741 (Beilstein Handbook Reference) BRN 2054497 Biphenyl, 2,2',6,6'-tetrachloro- PCB 54