New nitrosourea derivatives are provided, which possess a high inhibitory activity against the leukemia and tumors with a low toxicity and which are useful for pharmaceutical purposes. The compounds have the formula ##STR1## wherein A represents a glycosyl group, a monovalent residue of methyl glucoside or of alditol, a N-substituted carbamoyloxyalkyl group or a hydroxy-substituted cyclohexyl group when n is 1, or A represents a tetravalent residue of ribostamycin when n is 4 and R represents a lower alkyl or halo-alkyl group and are prepared by treating a compound of the formula ##STR2## with a nitrosating agent.
提供了一种新的亚硝基
脲衍
生物,具有对白血病和肿瘤高抑制活性,低毒性,适用于药物目的。该化合物的
化学式为 ##STR1## 其中,当n为1时,A表示糖基、
甲基葡萄糖苷或醇糖的一价残基、N-取代的
氨基甲氧基烷基或羟基取代的环己基基团;当n为4时,A表示核苷霉素的四价残基,R表示较低的烷基或卤代烷基,并通过与亚硝化剂处理式为 ##STR2## 的化合物来制备。