Chlorothalonil, 100 µg/ml, Cyclohexane, 1ml

Ammonium bicarbonate as (NH4+)

Sulfadiazine, 100 µg/ml, Methanol, 1ml

N-(4-chloro[13C6]phenyl)-N'-(3,4-dichloro[13C6]phenyl)[13C]urea , 1.2ml x 50ug/ml, methanol