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 95160 a,a-Dimethylphenethylamine Price on request 684599 2,2'-Methylenedianiline, 10mg Price on request 50709 ICP Mix #1 Price on request