Novel phospholipids, inclusive of pharmaceutically acceptable salts thereof, of the formula ##STR1## wherein R.sup.1 is an aliphatic hydrocarbon residue of 15 to 20 carbon atoms, R.sup.2 is an alkyl group of 1 to 4 carbon atoms and R.sup.3 is a hydrogen atom or an alkyl group of 1 to 4 carbon atoms, exhibit inhibitory activity to multiplication of tumor cells and are useful for inhibiting multiplication of tumor cells and prolonging the survival time of tumor-bearing warm-blooded animal.
                            新型
磷脂类化合物,包括其药学上可接受的盐,
化学式为##STR1## 其中R.sup.1是15至20个碳原子的脂肪烃残基,R.sup.2是1至4个碳原子的烷基,R.sup.3为氢原子或1至4个碳原子的烷基,对肿瘤细胞的增殖具有抑制作用,并可用于抑制肿瘤细胞的增殖并延长温血动物的存活时间。