The present invention relates to: a method for producing a novel lanthionine derivative having a CaSR agonistic activity an intermediate compound for the lanthionine derivative and use of the intermediate compound for the production of a CaSR agonist, a rich taste imparting agent and a raw material for foods or beverages.本發明係關於表示CaSR促效藥活性之新穎羊毛硫胺酸衍生物的製造方法、以及使用於用以製造該羊毛硫胺酸衍生物之中間體化合物、其中間體化合物之CaSR促效藥、濃郁風味賦予劑及飲食品原料。