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 71378 4,4’-Diamino-3,3’-dimethyldiphenylmethane Price on request 681371 Clodinafop-propargyl, 100mg Price on request 91875 EPA Method 8330Mix #1A Price on request