Used in organic synthesis as a key intermediate for producing peptides and other bioactive molecules. It serves as a precursor in the preparation of cysteine derivatives, which are essential in pharmaceuticals and biochemical research. The compound is also employed in the development of enzyme inhibitors and antioxidants due to its reactive thiol group. Additionally, it finds application in the study of protein structure and function, particularly in disulfide bond formation and reduction processes. Its hydrochloride form enhances solubility, making it suitable for various aqueous-based reactions.