Used as a chiral building block in the synthesis of pharmaceuticals, particularly in the development of protease inhibitors and other biologically active compounds. Its rigid pyrrolidine structure with defined stereochemistry makes it valuable for designing drugs targeting neurological disorders and metabolic diseases. Commonly employed in medicinal chemistry for structure-activity relationship (SAR) studies due to its ability to influence peptide conformation and enhance metabolic stability. Also utilized in the preparation of enzyme inhibitors where stereochemical control is critical for activity.