PROBLEM TO BE SOLVED: To provide a compound having cytostatic activity and anticancer activity.SOLUTION: The invention provides a compound represented by general formula (1) in the figure, or a salt thereof, or a solvate of the compound or salt thereof. [In general formula (1), Rrepresents a hydrogen atom or a protecting group for a hydroxy group, and Rand Rrepresent identical or different alkyl groups.]SELECTED DRAWING: None【課題】細胞増殖抑制作用、抗がん作用を有する化合物を提供すること【解決手段】一般式（１）：［一般式（１）中：Ｒ１は水素原子又は水酸基の保護基を示し、Ｒ２及びＲ３は同一又は異なってアルキル基を示す。］で表される化合物、その塩、又は該化合物若しくはその塩の溶媒和物【選択図】なし
