PROBLEM TO BE SOLVED: To provide a pharmaceutical composition that serves as an indoleamine 2,3-dioxygenase-1 inhibitor, and can be used particularly for the treatment and/or prevention of cancer.SOLUTION: A pharmaceutical composition contains a compound represented by formula I, a compound represented by formula I", or a mixture of them, or pharmaceutically acceptable enantiomers, salts or solvates thereof, or at least one pharmaceutically acceptable carrier [X is -NH- or -CQ2=CQ3- Q2 and Q3 independently represent H or a C1-6 alkyl].SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】インドールアミン2,3-ジオキシゲナーゼ-1阻害剤であり、特にがんの治療および/または予防において使用できる医薬組成物の提供。【解決手段】式I’で表される化合物、式I”で表される化合物、もしくはそれらの混合物或いは薬学的に許容できるその鏡像異性体、塩若しくは溶媒和物少なくとも1個の薬学的に許容できる担体とを含む医薬組成物。[Xは-NH-又は-CQ2=CQ3-;Q2及びQ3は夫々独立にH又はC1~6のアルキル]【選択図】図1
