PROBLEM TO BE SOLVED: To provide a prodrug compound by improving side effects with a naphthofuran compound, such as solubility, oral absorption property, persistence, gastrointestinal disturbance, or the like, and an anticancer agent having excellent solubility, oral absorption property and persistence, less side effect and high in safety.SOLUTION: The invention relates to a compound represented by the general formula (IA): wherein n represents an integer of 1 to 4, R1 represents a hydrogen atom, a halogen atom, or the like, R2 is C1-12 alkyl, C2-6 alkenyl, or the like, R3 represents a hydrogen atom, a halogen atom, or the like, or a pharmaceutically acceptable salt thereof.SELECTED DRAWING: NoneCOPYRIGHT: (C)2020,JPO&INPIT【課題】ナフトフラン化合物の溶解性、経口吸収性、持続性および消化管障害性等の副作用を改善したプロドラッグ化合物の提供。および、優れた溶解性、経口吸収性、持続性を有し、副作用が少なく安全性の高い抗癌剤の提供。【解決手段】本発明は、一般式（ＩＡ）：［式中、ｎは１～４の整数を、Ｒ１は、水素原子、ハロゲン原子等を、Ｒ２は、Ｃ１－１２アルキル、Ｃ２－６アルケニル等を、Ｒ３は、水素原子、ハロゲン原子等を示す。］で表される化合物またはその医薬上許容される塩に関する。【選択図】なし
