Used as a chiral building block in the synthesis of pharmaceuticals, particularly in the development of protease inhibitors and other bioactive molecules. Its rigid pyrrolidine structure with a defined stereochemistry makes it valuable for designing drugs that require high selectivity and binding affinity. Commonly employed in medicinal chemistry for structure-activity relationship (SAR) studies, especially in optimizing peptidomimetic compounds. Also utilized in asymmetric synthesis to introduce chirality in complex molecule construction.