PROBLEM TO BE SOLVED: To provide a new compound functioning as a glutamate receptor potentiator.SOLUTION: The 1H-isoindol-1-one compound is represented by formula (I) [wherein, R1 is a 3- to 7-membered ring which may contain a heteroatom R2 and R3 are each H or the like R4 and R6 are each H or the like R5 is a 5- to 7-membered ring which may contain a heteroatom or the like R7 is H, a halogen atom, 1-6C alkyl or the like R8 and R9 are each H or the like and n is a number of 1-8]. The method for producing the compound is provided. The pharmaceutical composition includes the compound. The compound is used in therapy.COPYRIGHT: (C)2012,JPO&INPIT【課題】グルタミン酸受容体の増強剤として機能する新規化合物の提供。【解決手段】式Iの1H-イソインドール-1-オン化合物、該化合物の製造方法、該化合物を含有する医薬組成物、及び該化合物の療法における使用。[式中、R1はヘテロ原子を含有してよい3~7員環;R2とR3はH等;R4とR6はH等;R5はヘテロ原子を含有してよい5~7員環等;R7はH、ハロゲン原子、C1-6-アルキル基等;R8とR9はH等;nは1~8の数を表す]【選択図】なし