Used as a chiral building block in the synthesis of pharmaceuticals, particularly in the development of protease inhibitors and antiviral agents. Its rigid pyrrolidine structure with defined stereochemistry makes it valuable for designing drugs that target specific enzyme active sites. Commonly employed in medicinal chemistry for optimizing potency and selectivity in drug candidates. Also utilized in the preparation of cyclic peptides and peptidomimetics due to its ability to induce specific conformational constraints.