13C3-Caffeine, 100 µg/ml, Methanol, 1ml

1,3-Dibromobenzene

N-Nitroso-N-methylaniline, 100μg/ml in MeOH, 5ml

1,2,3,6,7,8-Hexachlorodibenzo-p-dioxin ,50 µg/mL,n-nonane,1mL,