< Conversion 1 > As for this invention, as a, b and R1, R2, R3 and R4 is defined at description above, those uses in dealing with the obstacle and a state where you adjust the new imidazorijin 2 on derivative which possesses the structure which you follow the formula I which is, by the medicine manufacture study composition and the androgen receptor which contain those are designated as purpose.【化1】本発明は、a、b、R1、R2、R3及びR4が上記で定義された通りである式Iに従う構造を有する新規なイミダゾリジン-2-オン誘導体、それらを含有する製薬学的組成物ならびにアンドロゲン受容体により調節される障害及び状態の処置におけるそれらの使用を目的とする。