Novel maytansinoids of the formula:
wherein
X is hydrogen or chlorine,
R1 is C2-4 alkyl,
R2 is C2-8 alkyl which may be substituted or methyl which is substituted, have antimicrobial, antimitotic and antitumor activities.
式中的新型美坦素类化合物:
式中
X 是氢或
氯
R1 是 C2-4 烷基
R2 是可能被取代的 C2-8 烷基或被取代的甲基,具有抗菌、抗有丝分裂和抗肿瘤活性。