Thyroxine-13C6, 1mg

Pentachlorophenol, 5000µg/ml in MeOH, 1ml

Chlormequat-1,1,2,2-d4 chloride, 1000µg/ml in MeOH, 1ml

Perfluoro-n-hexadecanoic acid, 1.2ml x 50ug/ml, methanol