Sitagliptin, 100µg/ml in Acetonitrile, 5ml

Endosulfan sulfate (13C9), 100µg/mL in Nonane, 1,2

1,1,1,2-Tetrachloroethane

Tramadol-d6 hydrochloride, 100µg base/mL, Solvent-methanol, Unit 1mL, # of units-5, Cas.no.