PROBLEM TO BE SOLVED: To provide a therapeutic or preventive having SGLT1 inhibitory activity, and useful for treating diabetes, particularly type 2 diabetes mellitus.SOLUTION: The present invention provides a pharmaceutical composition containing a compound of formula [X] [where R1 is H or halogen； R2 is a C1-6 alkyl or haloalkyl； a ring Het is a substituted pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl or the like].SELECTED DRAWING: NoneCOPYRIGHT: (C)2020,JPO&INPIT【課題】ＳＧＬＴ１阻害活性を有し、糖尿病、特に２型糖尿病に有効な治療剤又は予防剤の提供。【解決手段】式［Ｘ］の化合物を含有する医薬組成物。［式中、Ｒ１はH又はハロゲン；Ｒ２はＣ１－６のアルキル又はハロアルキル；環Ｈｅｔは置換ピリジル、ピラジニル、ピリミジニル若しくはピリダジニル等を表す］【選択図】なし
