Cefalexin monohydrate, 250mg

p-n-Nonylphenol Monoethoxylate (ring-13C6), 100µg/ml in Nonane, 1,2ml

(S)-(+)-Pregabalin-d4 (aminomethyl d2; hexanoic acid-2,2-d2)

gamma-HCH, 100 µg/ml, Acetonitrile, 5ml