D8-Naphthalene, 2000 µg/ml, Acetonitrile, 1ml

Caffeine-13C3, 5mg

Clofentezine, 100 µg/ml, Methanol, 5ml

ISO 9377-2MOD Extraction Solvent Stock Solution I 20ul of n-Heptane and 20mg of n-Tetracontane solved in 1000ml n-Pentane