Cholesterol-d7, 2,5mg

2,2',3,3',4,4',5,6,6'-Nonabromo[13C12]diphenyl ether, 1.2ml x 50ug/ml, toluene

Dibutyl phthalate, 500mg

EPA Method 610 PAH Mix, in MeCH:MeOH, 1ml