Used as a key intermediate in the synthesis of pharmaceutical agents, particularly in the development of protease inhibitors and antiviral drugs. Its chiral structure (3R,4R) with fluorinated aryl group enhances binding selectivity and metabolic stability, making it valuable in optimizing drug candidates for improved potency and pharmacokinetics. Commonly employed in medicinal chemistry for structure-activity relationship studies due to its rigid pyrrolidine scaffold and functional handles for further derivatization.