An organophosphate pesticide; active against adult, but not arrested stage, O. ostertagi helminths; toxic to A. stephensi and A. aegypti mosquitoes when applied topically, with median lethal doses of 0.002 and 0.012 μg per female mosquito, respectively, but not when used as a contact insecticide; is lethal to rats (LD50s = 41 and 16 mg/kg for male and female rats, respectively)