Widely used in peptide synthesis, this compound serves as a chiral building block for introducing proline derivatives with defined stereochemistry. Its Fmoc-protected amine group allows for solid-phase peptide synthesis, enabling the stepwise assembly of peptides under mild conditions. The acetic acid side chain can be further functionalized, making it useful in the preparation of peptidomimetics and constrained cyclic peptides. It is particularly valuable in drug discovery and development for creating structurally diverse peptide libraries and optimizing biological activity.