Halogenated penam derivatives and the preparation thereof
申请人:Fujisawa Pharmaceutical Co., Ltd.
公开号:US04009159A1
公开(公告)日:1977-02-22
A penam derivative having the formula: ##STR1## wherein X represents a halogen atom, and wherein R.sub.1 represents an amino or acylamino, and R.sub.3 represents a radical selected from the group consisting of carboxy, ester, acid amide, acid anhydride, acid halide, and acid azide.