2,2',5,5'-TETRACHLOROBIPHENYL

2,2',5,5'-Tetrachlorobiphenyl is a polychlorinated biphenyl (PCB) compound historically used as a dielectric and coolant fluid in electrical equipment. Due to its high toxicity and carcinogenicity, production of PCBs was banned internationally under the Stockholm Convention on Persistent Organic Pollutants in 2001.