Resorcinol, 100000µg/mL in MTBE, 5 x 1ml

Ibuprofen Acyl-ß-D-glucuronide (mixture of diastereomers), 1mg

Venlafaxine O-desmethyl, 100mg

(±)-Desmethylcitalopram HCl, 1000µg/ml in MeOH,1ml