The present invention provides 4-substituted-3-{phenyl[(heterocyclylmethoxy)imino]methyl}-1,2,4-oxadiazol-5(4H)-one derivatives of formula (I) Wherein A and X1 to X3 and 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及X1至X3以及Y1至Y5表示各種取代基。