CAS 35693-99-3 appears in our catalog under these names: 2,2',5,5'-Tetrachlorobiphenyl, >95% (HPLC), PCB No. 52, PCB No. 52 10 µg/mL in Isooctane, PCB No. 52 100 µg/mL in Hexane, PCB No. 52 100 µg/mL in Isooctane. Offered by: TRC, Dr. Ehrenstorfer, Biosynth, Sigma-Aldrich, Roth. Available pack sizes: 100mg, 10mg, 1g, 10ml, 2ml, 5ml, 5mg, 25mg.