The present invention provides a compound of formula (1): ##STR1## wherein G is hydrogen, alkyl, alkenyl, substituted alkyl or substituted alkenyl, R.sub.1 is alkyl or aryl, substituted alkyl or substituted aryl, and R is an organic group such that --CO.sub.2 R is an ester group. The compounds are useful as antibacterial and .beta.-lactamase inhibitory agents.
本发明提供了一个化合物,其
化学式为(1):##
STR1## 其中G是
氢、烷基、
烯基、取代烷基或取代
烯基,R.sub.1是烷基或芳基,取代烷基或取代芳基,而R是一个有机基团,使得--CO.sub.2 R是一个
酯基团。这些化合物可用作抗菌和
β-内酰胺酶抑制剂。