Method 1640Mix A Back Catalog number: 53146 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 2778.10-100-AN Heptachlor-exo-epoxide (cis-) Price on request C15606500 N-Nitrosopiperidine, certified, 25mg Price on request MCDE-3 4-Chloro[13C12]diphenyl ether, 1.2ml x 50ug/ml, nonane Price on request