Taxol derivatives or their salts having the formula as following: Wherein, R1, R2, Z1, Z2, Z3 and Z4 are defined as the description. Their preparation methods and their use as antitumor agent are also disclosed.
                            紫杉醇衍
生物或其盐的
化学式如下:其中,R1、R2、Z1、Z2、Z3和Z4的定义如描述所示。还公开了它们的制备方法和作为抗肿瘤剂的用途。