Theophylline, 100µg/ml in MeOH, 5ml

Perfluoro-4-methyloctanoic acid, 1.2ml x 50ug/ml, methanol

Pentachloronitrobenzene-13C6,100 µg/mL,n-nonane,1mL,

Tetrahydro-5-methyl-2-furanMeOH,1000 µg/mL,MeOH,1mL