The present invention provides 4-substituted-3-{phenyl[(heterocyclylmethoxy)imino]methyl}-1,2,4-oxadiazol-5(4H)-one derivatives of formula (I)Wherein A, X1 to X3, Y1 to Y5 represent various substituents本發明提供式(I)之4-取代-3-{苯基[(雜環基甲氧基)亞胺]甲基}-1,2,4-噁二唑-5(4H)-酮衍生物,其中A、X1至X3、Y1至Y5表示各種取代基。