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 90397 Surrogate Standard Price on request 34042 EPA Method 531.2 - Analytes Price on request 73685 4-Hydroxy-2-butanone Price on request