1,1'-Biphenyl, 2,3',5-trichloro- 2,3',5-TRICHLOROBIPHENYL 2,3,5-Trichlorobiphenyl 2,5,3'-Trichlorobiphenyl 3,2',5'-Trichlorobiphenyl 38444-81-4 BRN 4415968 PCB 26