CAS 74338-24-2 appears in our catalog under these names: PCB No. 55, PCB No. 55 10 µg/mL in Isooctane, 2,3,3',4–Tetrachlorobiphenyl, 2,3,3',4-Tetrachlorobiphenyl, PCB 55, ROTI®Star, 10 mg, glass. Offered by: Dr. Ehrenstorfer, GLPBio, Biosynth, Roth, HPC Standards. Available pack sizes: 5mg, 10ml, 1ml, 25ml, 50ml, 10mg, 1x5ml.