申请人:The United States of America as represented by the Department of Health
公开号:US06136992A1
公开(公告)日:2000-10-24
Compounds represented by the following structural formula: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are as defined in the specification. The compounds are disclosed as useful in the treatment of various forms of cancer.