Synonyms: 2,2',3,4,5'-Pentachloro-1,1'-biphenyl;2,2',3,4,5'-Pentachlorodiphenyl;2,2’,3,4,5’-pentachloro-1’-biphenyl;2,2’,3,4,5’-pentachlorodiphenyl;2,3,4,2',5'-Pentachlorobiphenyl;2,3,4,2’,5’-pentachlorobiphenyl;2,5,2',3',4'-Pentachlorobiphenyl;2,5,2’,3’,4’-pentachlorobiphenyl