Internal Standard

Lansoprazole, neat, Solvent-neat, Unit 500mg, # of units-1, Cas.no. 103577-45-3

beta-Estradiol hemihydrate, 100 µg/ml, Methanol,

Isocaffeine (1,3,9-Trimethylxanthine), neat, Solvent-neat, Unit 10mg, # of units-1, Cas.no. 519-32-4