13C3-Caffeine, 100 µg/ml, Methanol, 1ml Back Catalog number: 681491 Manufacturer: HPC STANDARDS GmbH Availability: In the manufacturer's stock Price on request - + Recommended 71494 Methyl quinoxaline-2-carboxylate Price on request P-024S-1 o,p'-DDD, 200µg/ml in Isooctane, 1ml Price on request 13-B-278-CDF 1,3-Dibromo-2,7,8-trichlorodibenzofuran, 1.2ml x 50ug/ml, toluene Price on request