Betaxolol hydrochloride, 10mg

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

Isosorbide, 1g

13C6-Thiabendazole, 100 µg/ml, Acetonitrile, 1ml