2,4-D

1,2,3,4-Tetrachloro[13C12]dibenzo-p-dioxin , 1.2ml x 50ug/ml, toluene

Caffeine-d9 (1,3,7-trimethyl-d9),neat,neat,10mg

N-Nitrosodiethylamine, 1000μg/ml in MeOH, 1ml