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 40003 EPA Method 601 - Purgeables Mix #4 Price on request 71715 4,6-Dimethyldibenzothiophene Price on request 73571 Transfluthrin Price on request