PROBLEM TO BE SOLVED: To provide crystal systems of grapiprant with good physicochemical properties as pharmaceuticals； and a process for preparing the same.SOLUTION: The invention provides a crystalline form of grapiprant selected from the group consisting of Form X, Form X2, Form X3, Form F, Form K, Form L, Form M, and Form N. Also provided is a pharmaceutical composition comprising the crystalline form. Further provided is a process for preparing a crystalline Form A of grapiprant comprising, e.g., bringing a crystalline Form D or J of grapiprant into contact with a solvent comprising dichloromethane and acetone in a volume ratio of 1:3 or 1:9.SELECTED DRAWING: None【課題】医薬品としての物理化学的特性が良好なグラピプラントの結晶系及びその製法の提供。【解決手段】Ｘ型、Ｘ２型、Ｘ３型、Ｆ型、Ｋ型、Ｌ型、Ｍ型、およびＮ型から成る群より選択されるグラピプラントの結晶型、および該結晶系を含有する医薬組成物。ジクロロメタンおよびアセトンを体積比１：３又は１：９で含む溶媒に結晶型Ｄ又はＪのグラピプラントを接触させること等を含む、グラピプラントの結晶型Ａの製法。【選択図】なし
