Used primarily in pharmaceutical research as a key intermediate in the development of protease inhibitors, particularly for hepatitis C virus (HCV) treatment. Its naphthyl and pyrrolidine structure enables strong binding to enzyme active sites, enhancing inhibitory activity. Also explored in the synthesis of kinase inhibitors for oncology applications due to its ability to penetrate cell membranes and stabilize target-ligand interactions. Shows potential in improving metabolic stability and bioavailability in drug candidates.