D4-Ethylparaben, 100 µg/ml, Acetonitrile, 1ml

Mixed Alcohols, Butanol/Methanol (63:37)

5-Chloro-2-(2,4-dichloro[13C6]phenoxy)[13C6]phenol, 1.2ml x 50ug/ml, methanol

Warfarin-d5 (phenyl-d5), 100µg/ml in MeOH, 1ml