Novel nitrosourea derivatives are provided which possess a high level of inhibitory activity against leukemia and tumors and which are therefore useful for pharmaceutical purposes. The compounds have the structure represented by formula (I): ##STR1## wherein R.sub.0 represents --OH or --OC.sub.m H.sub.2m+1 where m is an integer of 1 to 3 and one of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 represents ##STR2## where X is ##STR3## or an alkylene group of 1 to 3 carbon atoms, n is an integer of 1 to 3 and Y is the group on the .alpha.-carbon atom of an .alpha.-amino acid and each of the remaining three represents --OH; or wherein R.sub.0 represents ##STR4## and R.sub.1, R.sub.2, R.sub.3 and R.sub.4 each represent --OH; or by formula (II): ##STR5## wherein X and n have the same meanings as above; and p is an integer of 1 to 5.
提供了一种新的亚硝基
脲衍
生物,其具有高
水平的抗白血病和肿瘤的抑制活性,因此可用于制药目的。该化合物具有以下式子所表示的结构(I):
##STR1##
其中R.sub.0代表--OH或--OC.sub.m H.sub.2m+1,其中m是1到3的整数,而R.sub.1、R.sub.2、R.sub.3和R.sub.4中的一个代表
##STR2##
其中X是##STR3##或1到3个碳原子的烷基,n是1到3的整数,Y是
α-氨基酸的α-碳原子上的基团,其余三个分别代表--OH;或者其中R.sub.0代表##STR4##,而R.sub.1、R.sub.2、R.sub.3和R.sub.4均代表--OH;或者由式子(II)所表示的结构:
##STR5##
其中X和n的含义与上面相同,而p是1到5的整数。