The present disclosure relates to the field of pharmaceutical synthesis, and more particularly, relates to a monocyclic β-lactam-siderophore conjugate as well as a method for synthesizing same and its use in the treatment of bacterial infectious diseases. Provided are a monocyclic β-lactam-siderophore conjugate represented by formula (I) as described herein, an optical isomer thereof or a pharmaceutically acceptable salt thereof, and a method for synthesizing same, and a use thereof in treating bacterial infectious diseases.
