2,3,3',4,4',5'-Hexachlorobiphenyl (157) Back Catalog number: 68157 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 675883 Pipemidic acid, 250mg Price on request 684226 N-Nitrosopiperidine, 100µg/ml in MeOH, 5ml Price on request 70226 3-Nitroaniline Price on request