Used primarily as a protected amino acid derivative in solid-phase peptide synthesis. The Fmoc group provides temporary protection for the amine functionality, allowing selective reaction at other sites. Its but-3-en-1-yl group enables further modification through cross-metathesis or conjugation reactions. Commonly employed in the preparation of peptide intermediates, especially in pharmaceutical research and development of bioactive peptides. Stable under a range of reaction conditions, making it suitable for automated synthesis protocols.