Mass Spectrometry (Xevo TQ-S) standard for system assessment. 1 X 30mL Set Up Solution TQ-S: PPG1000 250 pg/ul, Triacetyl-B-cyclodextrin 500 pg/ul, Verapamil 100 pg/ul, Leucine Enkaphalin 0.31 mg/ml, Ammonium Acetate Acetonitrile/Water (1:1 V/V) Certificate of Analysis