13C6-Halofuginone hydrobromide, 100 µg/ml, Aceton

1,3,5-Trichlorobenzene, 100 µg/ml, Methanol, 1ml

1,3,6,8-Tetrachloro[13C12]dibenzo-p-dioxin, 1.2ml x 50ug/ml, toluene

Atrazine-d5, 100µg/ml in Acetone, 1ml