Used in peptide synthesis as a protected amino acid building block, particularly in solid-phase synthesis. The Fmoc group provides temporary protection for the amine functionality, allowing selective coupling reactions. The alkene moiety enables post-assembly modifications via click chemistry or hydrogenation, while the carboxylic acid allows for amide bond formation. Commonly employed in the preparation of structured peptides and peptidomimetics where stereochemistry and side-chain functionality are critical. Its phenyl and fluorenyl groups add hydrophobic character and aid in purification through HPLC.