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 97913 Difenzoquat Price on request 675138 Carfentrazone-ethyl, 100 µg/ml, Acetonitrile, 5m Price on request 92839 1-Methylphenanthrene Price on request