Similar names: 1,1'-Biphenyl-1,1',2,2',3,3',4,4',5,5',6,6'-13C12, 2,2',3,3',5,5',6-heptachloro- (9CI); 13C12-2,2',3,3',5,5',6-Heptachlorobiphenyl; 13C12-2,2',3,3',5,5',6-HpCB; 13C12-PCB 178; PCB 178-13C12; 2,2',3,3',5,5',6-Heptachloro-1,1'-biphenyl 13C12; 2,2',3,3',5,5',6-Heptachlorobiphenyl 13C12; 2,3,5,2',3',5',6'-Heptachlorobiphenyl 13C12; 2,3,5,6,2',3',5'-Heptachlorobiphenyl 13C12; PCB 178 13C12; 2,2',3,3',5,5',6-HeptaCB-13C12