PROBLEM TO BE SOLVED: To provide an inhibitor for cytochrome P450 monooxygenase and a synthetic intermediate thereof.SOLUTION: Using a compound of formula IV as a raw material, a compound of formula I and a salt thereof are prepared through a multistage reaction.SELECTED DRAWING: None【課題】チトクロームP450モノオキシゲナーゼの阻害剤及びその合成中間体の提供。【解決手段】式IVの化合物を原料とし、多段階反応を経て式Iの化合物及びその塩を調製する。【選択図】なし