4-(2,4-Dichlorophenoxy-3,5,6-d3)butyric Acid

beta-Endosulfan-d4 (1,1,5,5-d4),100 µg/mL,n-nonane,1mL,

beta-Endosulfan, 10.0 µg/ml, Ethyl acetate, 10ml

Theophylline, 100μg/mL in Acetonitrile, 1ml