L-Valine, 250mg

3,4,4'-Trichloro[13C12]diphenyl ether, 1.2ml x 50ug/ml, nonane

7-Bromo-2,3-dichlorodibenzo-p-dioxin (96%), 1.2ml x 48ug/ml, toluene

PCB 52-d3, 10µg/ml in Cyclohexane, 5ml