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 7-B-23-CDD 7-Bromo-2,3-dichlorodibenzo-p-dioxin (96%), 1.2ml x 48ug/ml, toluene Price on request 673763 Climbazole, 100 µg/ml, Ethyl acetate, 5ml Price on request 79896 Hexamethylenetetramine Price on request