Widely used in peptide synthesis, this compound serves as a chiral building block for introducing alkyne functionality into peptide chains. The presence of the terminal alkyne allows for site-specific modification via click chemistry, particularly copper-catalyzed azide-alkyne cycloaddition (CuAAC). This is valuable in bioconjugation, enabling attachment of fluorophores, biotin, or other functional tags for detection, imaging, or immobilization. The Fmoc group ensures compatibility with standard solid-phase peptide synthesis (SPPS), allowing stepwise assembly under mild basic conditions. Its stereochemistry helps maintain desired peptide conformation, making it useful in the development of structured peptides, probes, and peptide-based therapeutics.