Metoprolol tartrate, 100 µg/ml, Methanol, 1ml

2H,2H,3H,3H-Perfluoroundecanoic acid, 50µg/mL in MeOH, 1ml

Ethanol standard in serum,0.1g/L,serum, 1.5mL

13C3-Melamine, 10mg