Propanil, 100 µg/ml, Acetonitrile, 5ml

Difloxacin hydrochloride, 100 µg/ml, Methanol, 1

d4 C29 alpha alpha alpha (20R)-Ethylcholestane, 100µg/mL in Isooctane, 1ml

N-Nitrosodiisopropylamine, 50mg