The chemical compound which possesses the pest control activity where this invention confronts the noxious insect and is superior, is displayed with formula (i) or the approved possible salt, and the aforementioned chemical compound with respect to the farm art or the noxious insect pest control medicine which contains the approved possible salt with respect to that farm art as the active ingredient are offered.(In formula, two R display the respective hydrogen atom, or become simultaneous and show the oxo basis.)本発明は、害虫に対する優れた防除活性を有する、式(I)で表される化合物またはその農園芸上許容可能な塩、並びに、前記化合物またはその農園芸上許容可能な塩を有効成分として含有する害虫防除剤を提供する。(式中、二つのRはそれぞれ水素原子を表すか、または一緒になってオキソ基を示す。)
