2,4-Diaminopteridine derivatives and the pharmaceutically acceptable salts thereof having potent anticancer activity are disclosed. The derivatives possess the structural formula: ##STR1## wherein Y is NH.sub.2, OH or SH, R is ##STR2## and X is ##STR3## in which R' is H or CH.sub.3 or ##STR4## in which R and R' are as previously defined, provided when Y is NH.sub.2, R' must be CH.sub.3 and when Y is OH, R' must be OH.
公开了具有强效抗癌活性的2,4-二
氨基
喜树碱衍
生物及其药学上可接受的盐。这些衍
生物具有结构式:##STR1## 其中Y是NH.sub.2、OH或SH,R是##STR2##,X是##STR3##,其中R'是H或CH.sub.3或##STR4##,其中R和R'如前所定义,但当Y为NH.sub.2时,R'必须为CH.sub.3,当Y为OH时,R'必须为OH。