2006-10-23T12:00:00.00bca65cfc-179a-4376-abc8-da030c1bb1d82006-10-23T12:00:00.00false1,1'-biphenyl, 2,2',4,5'-tetrachloro- (9CI)2,2',4,5'-tetrachloro-1,1'-biphenyl2,2',4,5'-tetrachlorobiphenyl2,2',4',5-tetrachlorobiphenyl2,4,2',5'-tetrachlorobiphenyl2,5,2',4'-tetrachlorobiphenylPCB 492,2',4,5'-tetrachlorobiphenyl (CB49)