Thyroxine-13C6, 1mg

1,2,4,5,8-Pentachloronaphthalene, 1.2mL x 50ug/mL, nonane

2-Phenyl-5-benzimidazolesulfonic acid, 100mg

2,5-Dichloro[13C12]biphenyl, 1.2ml x 50ug/ml, nonane