申请人:DONG-A PHARM. CO., LTD.
                            
                            
                                公开号:EP0424899A2
                            
                            
                                公开(公告)日:1991-05-02
                            
                            
A compound of the formula (I)
 wherein R₁ and R₂ represent respectively hydrogen atom or together form straight or branched alkylidene group of 1-10 carbon atoms, Y represents
 R₃ represents hydrogen atom, C₁₋₁₀ alkyl group of C₁₋₁₀ alkoxycarbonyl, R₄ and R₅ represent respectively hydrogen atom or C₁₋₅ alkyl group, n represents 0 or an integer of 1-10, and m represents an integer of 1-5, and pharmaceutically acceptable salt thereof are novel and have excellent antitumor activity.  
                            式 (I) 的化合物
 其中 R₁ 和 R₂ 分别代表氢原子或共同形成 1-10 个碳原子的直链或支链亚烷基,Y 代表
 R₃ 代表氢原子、C₁₋₁₀ 烷氧基羰基,R₄ 和 R₅ 分别代表氢原子或 C₁₋₅ 烷基、n 代表 0 或 1-10 的整数,m 代表 1-5 的整数。