Avermectin B1b, 100 µg/ml, Acetonitrile, 1ml

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

1,2,3,6,7-Pentachloronaphthalene, 1.2mL x 50ug/mL, nonane

Ceftazidime-d5 (90%), 1mg