CAS 33284-54-7 appears in our catalog under these names: 2,3,5,6-Tetrachlorobiphenyl, PCB No. 65 10 µg/mL in Isooctane, 2,3,5,6,–Tetrachlorobiphenyl, PCB 65, ROTI®Star, 25 mg, glass. Offered by: TRC, Dr. Ehrenstorfer, GLPBio, Roth. Available pack sizes: 25mg, 10ml, 1ml.