Novel compound represented by the formula:
wherein R' stands for an aliphatic hydrocarbon group substituted with a hydrophilic group; R⁰ stands for a lower alkyl group; R¹
and R² independently stand for a hydrogen atom or an optionally substituted lower hydrocarbon group;
X¹ and X² independently stand for -O-, -S(O)κ-(κ denotes a whole number of 0 to 2),
(R³ stands for a hydrogen atom or an optionally substituted lower hydrocarbon group) or an optionally substituted methylene group: i denotes a whole number of 1 to 3;
and R¹ and R² may be different from each other at the repetition of the number i, or a salt thereof which has a topoisomerase I inhibition activity and is useful as an antitumor agents.
由式表示的新型化合物:
其中 R' 代表被亲
水基团取代的脂肪族烃基; R⁰ 代表低级烷基; R¹
和 R² 分别代表氢原子或任选取代的低级烃基;
X¹和X²分别代表-O-、-S(O)κ-(κ表示0至2的整数)、
(R³代表氢原子或任选取代的低级烃基)或任选取代的亚甲基:i 表示 1 至 3 的整数;
R¹和R²在数字i的重复处可能互不相同,或其盐具有拓扑异构酶I抑制活性,可用作抗肿瘤剂。