PROBLEM TO BE SOLVED: To provide compounds serving as inhibitors for the interaction between p53 and MDM2.SOLUTION: The present invention provides a compound represented by formula (I) or salt thereof. (A is the following formula or the like; B is phenylene or the like; Ris halo or the like; Ris F or the like; Ris isobutyl or the like).SELECTED DRAWING: None【課題】p53とMDM2との相互作用の阻害剤として作用する化合物の提供。【解決手段】式(I)で表される化合物又はその塩。(Aは下式等;Bはフェニレン等;R1はハロ等;R2はF等;R3はイソブチル等)【選択図】なし