Used as a chiral building block in the synthesis of pharmaceuticals, particularly in the development of protease inhibitors and other bioactive molecules. Its protected amine and carboxylic acid functionalities make it suitable for peptide coupling and sequential organic transformations. The presence of the allyl group allows for further modification via metathesis or other transition metal-catalyzed reactions. Commonly employed in medicinal chemistry for structure-activity relationship studies due to its rigid pyrrolidine scaffold and defined stereochemistry.