Used as a key intermediate in the synthesis of β-lactam antibiotics, particularly in the production of penems and carbapenems. Its strained azetidine ring and thiol functionality enable efficient construction of complex antibiotic scaffolds. The compound is also employed in medicinal chemistry for developing enzyme inhibitors and other bioactive molecules requiring a rigid, sulfur-containing heterocycle. Its hydrochloride salt form enhances stability and solubility in aqueous reaction systems.