Used primarily in peptide synthesis as a chiral building block, this compound serves as a protected amino acid derivative featuring an alkene side chain. The (S)-configuration ensures stereochemical control during the assembly of complex peptides. The Fmoc group provides temporary protection of the amine functionality, allowing for selective deprotection under mild basic conditions, which is compatible with solid-phase peptide synthesis (SPPS). The terminal alkene in the pentenyl side chain enables further functionalization via reactions such as cross-metathesis or thiol-ene coupling, making it valuable for introducing labels, conjugating peptides to carriers, or constructing cyclic or branched peptide architectures. Its utility extends to the development of bioactive peptides, peptide-protein conjugates, and peptidomimetics in medicinal chemistry and biochemical research.