(-) -Menthone is a monoterpene component of the essential oil of maturing peppermint. (+) -Neomenthyl-β-d-glucoside is a metabolite of (-) -Menthone[1].Mortality of two biological forms of Anopheles stephensi (larvae) exposed to about 45 ppm (-) -Menthone is 27.67% and 94.92%. [2]