PROBLEM TO BE SOLVED: To provide a novel compound that has a glycogen synthase activating ability, but is less prone to activate the receptor PPAR and thus has high safety, and a pharmaceutical composition for diabetes treatment comprising the compound.SOLUTION: There is provided a compound represented by Formula (I), or a pharmaceutically acceptable salt thereof, wherein Ar1 is phenyl group or benzofuran group, benzothiophene group or the like Ar2 is heteroaromatic ring L is a bond, alkylene group or cycloalkylene group X is H or halogen, hydroxyl group, alkoxy group, cyano group, amino group, alkylamino group, 5-7-membered hetero ring or the like and Y is H or alkyl group.SELECTED DRAWING: NoneCOPYRIGHT: (C)2017,JPO&INPIT【課題】グリコーゲンシンターゼ活性化能を有するが、受容体PPARが活性化されることが少なく安全性が高い新規化合物、及び該化合物を含有する糖尿病治療用医薬組成物の提供。【解決手段】式(I)で表される化合物、又はその医薬上許容される塩。(Ar1はフェニル基又はベンゾフラン基、ベンゾチオフェン基等;Ar2は芳香族複素環;Lは結合、アルキレン基又はシクロアルキレン基;XはH又はハロゲン、ヒドロキシル基、アルコキシ基、シアノ基、アミノ基、アルキルアミノ基、5員~7員の複素環等;YはH又はアルキル基)【選択図】なし
