Used in solid-phase peptide synthesis as a chiral building block for incorporating a long-chain alkenyl-modified amino acid residue into peptide sequences. The Fmoc group allows for orthogonal protection in stepwise synthesis, making it compatible with standard Fmoc/tBu strategies. The terminal alkene in the side chain enables post-synthetic modifications via olefin metathesis or thiol-ene chemistry, useful in bioconjugation, peptide labeling, or constructing peptide-based polymers and biomaterials. Commonly applied in medicinal chemistry and chemical biology for developing functionalized peptides with tailored properties.