Used in solid-phase peptide synthesis as a chiral building block for incorporating a long aliphatic side chain with a terminal alkene functionality. The Fmoc group allows for orthogonal protection in stepwise synthesis, enabling the construction of complex peptides with site-specific modifications. The terminal alkene in the heptenyl side chain serves as a handle for post-synthetic modifications, such as thiol-ene coupling or cross-metathesis, useful in bioconjugation, peptide labeling, or creating peptide-polymer hybrids. Commonly applied in the development of peptide-based therapeutics, probes, and biomaterials where controlled functionalization is required.