Used as a chiral building block in the synthesis of pharmaceuticals, particularly in the development of antiviral and antidiabetic agents. Its rigid pyrrolidine structure with defined stereochemistry makes it valuable for designing enzyme inhibitors. Commonly employed in medicinal chemistry for structure-activity relationship (SAR) studies due to its ability to mimic peptide motifs while offering improved metabolic stability. Also utilized in the preparation of proline analogs and peptidomimetics.