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 X9049 Chrysene Price on request 9773.23 Zolpidem hemitartrate, , Solvent-, Unit , # of units-, Cas.no. 99294-93-6 Price on request 0250.26-200-T Peropyrene, 200µg/mL, Solvent-toluene, Unit 1mL, # of units-1, Cas.no. 188-96-5 Price on request