CAS 56558-16-8 appears in our catalog under these names: PCB No. 104, 2,2',4,6,6'–Pentachlorobiphenyl, 2,2',4,6,6'-Pentachlorobiphenyl, PCB 104, Concentration: 100 µg/ml Solvent: Isooctane. Offered by: Dr. Ehrenstorfer, GLPBio, Biosynth, HPC Standards. Available pack sizes: 5mg, 1ml, 10mg, 25mg, 50mg, 1x5ml.