Acetylsalicylic acid-d4 (ring-d4),100 µg/mL,MeOH,1mL,

2,6-Diethylaniline, 100 µg/ml, Methanol, 1ml

EPA Method 533 Isotope Dilution Standard PDS, 1.2ml, methanol

Metronidazole-hydroxy, 100 µg/ml, Methanol, 1ml