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 82483 EPA Method 8325 Surrogate Standard Price on request 71692 1,2-Dimethoxyethane Price on request 79362 cis-Chlordane Price on request