Novel uracil derivatives of the formula
(wherein R1, R2, R3 and X are defined in the description) and their pharmaceutically acceptable salts, process for preparing the same and pharmaceutical composition containing the same are disclosed. The uracil derivatives have good antitumor activity and, therefore, are useful as antitumor preparation.
本发明公开了式中(其中 R1、R2、R3 和 X 在描述中定义)的新型尿
嘧啶衍
生物及其药学上可接受的盐、制备方法和含有这些衍
生物的药物组合物。 这些尿
嘧啶衍
生物具有良好的抗肿瘤活性,因此可用作抗肿瘤制剂。