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 673275 Ethiofencarb-sulfoxide, 100 µg/ml, Acetonitrile, Price on request MET-12007A-100MG Phthalamic acid, 100mg Price on request 90459 tert-Butanol Price on request