Used as a chiral building block in the synthesis of pharmaceuticals, particularly in the development of enzyme inhibitors and bioactive molecules. Its fluorinated pyrrolidine structure enhances metabolic stability and binding affinity in drug candidates. Commonly employed in medicinal chemistry for optimizing pharmacokinetic properties, especially in central nervous system agents and antiviral drugs. The hydrochloride salt form improves solubility and crystallinity, facilitating handling and formulation in synthetic routes.