Compounds of formula (I): ##STR1## wherein: R.sup.1, R.sup.2 and R.sup.3 are independently selected from the group consisting of hydrogen atoms, optionally substituted alkanoyl groups and alkenylcarbonyl groups, PROVIDED THAT at least one of R.sup.1, R.sup.2 and R.sup.3 represents an unsubstituted alkanoyl group having from 5 to 24 carbon atoms, said substituted alkanoyl group or said alkenylcarbonyl group; and one of R.sup.4 and R.sup.5 represents a hydrogen atom and the other represents a cyano group; have valuable anti-tumor activity.
式(I)的化合物:##STR1## 其中:R.sup.1、R.sup.2和R.sup.3独立地选自氢原子、可选择取代的烷酰基团和烯基羰基基团的组,前提是至少有R.sup.1、R.sup.2和R.sup.3中的一个代表具有5到24个碳原子的未取代烷酰基团,所述取代烷酰基团或所述烯基羰基基团;R.sup.4和R.sup.5中的一个代表氢原子,另一个代表
氰基;具有宝贵的抗肿瘤活性。