Internal Reference Standard Back Catalog number: 52187 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 12172.2-2K-ME Acetonitrile-1,2-13C2,2000 µg/mL,MeOH,1mL, Price on request 96554 (±)-Norketamine HCl Price on request 674921 D8-4,4'-DDT, 10mg Price on request