PROBLEM TO BE SOLVED: To provide a novel ivacaftor derivative and a pharmaceutically acceptable salt thereof.SOLUTION: There is provided a deuterium-modified compound represented by the formula I.COPYRIGHT: (C)2014,JPO&INPIT【課題】新規イバカフトル(ivacaftor)誘導体、およびその薬学的に許容される塩の提供。【解決手段】式Iの重水素修飾化合物:【選択図】なし