TO SEARCH A NUMBER OF VARIATION COMPOUNDS HAVING A CASR AGONIST ACTIVITY IN ORDER TO OBTAIN A SUBSTANCE HAVING A MORE EXCELLENT KOKUMI-IMPARTING FUNCTION, AND MORE PARTICULARLY TO PROVIDE A KOKUMI-IMPARTING AGENT, WHICH CONTAINS THE FOREGOING SUBSTANCE, AND A COMPOSITE KOKUMI-IMPARTING AGENT, WHICH LIKEWISE CONTAINS THE AFOREMENTIONED SUBSTANCE AND ANOTHER SUBSTANCE HAVING A CASR AGONIST ACTIVITY AS WELL, IN COMBINATION A KOKUMI-IMPARTING AGENT COMPRISES A LANTHIONINE DERIVATIVE AND A COMPOSITE KOKUMI-IMPARTING AGENT COMPRISING THE LANTHIONINE DERIVATIVE AND ANOTHER SUBSTANCE HAVING A CASR AGONIST ACTIVITY.
