PROBLEM TO BE SOLVED: To provide novel transglutaminase activators, ceramide production promoters, and involucrin expression promoters, for promoting the enhancement of the function of the stratum corneum of a skin.SOLUTION: This invention provides a compound represented by formula (1), where R1 and R2 represent a hydrogen atom, or the like, R3 represents a hydrogen atom, or a group capable of binding to R2 to form a methylenedioxy group, R4 and R5 represent a hydrogen atom, or groups capable of binding to each other to form a methylenedioxy group, and R6 represents a hydrogen atom, or the like.COPYRIGHT: (C)2014,JPO&INPIT【課題】皮膚の角質層の機能の強化を促進する、新規なトランスグルタミナーゼ活性化剤、セラミド産生促進剤、及びインボルクリン発現促進剤を提供すること。【解決手段】式(1)で表される化合物。[式(1)中、R1及びR2は水素原子などを表し、R3は水素原子、又はR2と結合してメチレンジオキシ基を形成する基を表し、R4及びR5は水素原子、又は互いに結合してメチレンジオキシ基を形成する基を表し、R6は水素原子などを表す。]【選択図】なし
