Sildenafil citrate,100 µg base/mL,MeOH,1mL

Perfluoro-n-[3,4,5-13C3]pentanoic acid, 1.2ml x 50ug/ml, methanol

17?(H),21ß(H)-(22S)-Homohopane, 500µg/mL in Isooctane, 1mL

Thionazin, 100 µg/ml, Acetonitrile, 1ml