PROBLEM TO BE SOLVED: To provide a novel compound having a certain chemical structure with the activity of inhibiting the formation of a c-Myc/Max/DNA complex.SOLUTION: The present invention provides a compound represented by the following formula or a pharmaceutically acceptable salt thereof. [R-R, Rand Y independently represent H, alkyl, aryl or the like; Ris Calkyl, cycloalkyl, phenyl or the like; n is an integer of 0-2].SELECTED DRAWING: None【課題】c-Myc/Max/DNA複合体の形成を抑制する活性を有する特定化学構造の新規化合物又はこれの薬学的に許容可能な塩の提供。【解決手段】以下の式で代表される化合物又はこれの薬学的に許容可能な塩。[R1a~R1d、R2及びYは各々独立にH、アルキル、アリール等;R3はC1-4アルキル、シクロアルキル、フェニル等;nは0~2の整数]【選択図】なし