Used as a key chiral intermediate in the synthesis of pharmaceuticals, particularly in the production of protease inhibitors and antiviral agents. Its cyclopropyl-containing structure with defined stereochemistry makes it valuable for constructing biologically active molecules where stereocontrol is critical. Commonly employed in the development of drugs targeting hepatitis C virus (HCV) and other viral infections due to its ability to enhance metabolic stability and binding affinity. Also utilized in the preparation of peptidomimetics, where the cyclopropyl group imparts conformational rigidity, improving potency and selectivity.