4-Bromobiphenyl, 1.2ml x 50ug/ml, nonane

rac N-Desmethyl Tramadol-d3 Hydrochloride, 1mg

L-(+)-Lactic Acid-13C3 Sodium Salt, 5mg

Perfluoro-n-[1,2-13C2]decanoic acid, 1.2ml x 50ug/ml, methanol