CAS 15968-05-5 appears in our catalog under these names: PCB No. 54, PCB No. 54 10 µg/mL in Isooctane, 2,2'6,6'–Tetrachlorobiphenyl, PCB 54, Concentration: 100 µg/ml Solvent: Isooctane. Offered by: Dr. Ehrenstorfer, GLPBio, HPC Standards. Available pack sizes: 25mg, 10ml, 1ml, 1x5ml.