The present invention relates to heterocyclic compounds, their process of preparation, pharmaceutical compositions comprising these compounds and use thereof, optionally in combination with other antibacterial agents and/or beta-lactam compounds, for the prevention or treatment of bacterial infections. The present invention also relates to the use of these compounds as β-lactamase inhibitors and/or as antibacterial agents.本發明係關於雜環化合物、其製備方法、包含此等化合物之醫藥組合物及其視情況與其他抗細菌劑及/或β-內醯胺化合物組合用於預防或治療細菌感染之用途。本發明亦關於此等化合物作為β-內醯胺酶抑制劑及/或作為抗細菌劑之用途。無