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 679912 1,4-Androstadiene-3,17-dione, 100mg Price on request 19397 a,a,a-Trifluorotoluene Price on request PN-21S 1,3,7-Trichloronaphthalene, 1.2mL x 50ug/mL, nonane Price on request