Widely used in peptide synthesis, this compound serves as a key building block for introducing orthogonally protected amino acids into growing peptide chains. Its primary application lies in solid-phase peptide synthesis (SPPS), where the Fmoc group provides temporary Nα-amino protection that can be selectively removed under mild basic conditions, leaving other protecting groups intact. The alkyne functionality in the side chain allows for use in copper-catalyzed azide-alkyne cycloaddition (CuAAC) click chemistry, enabling efficient bioconjugation, fluorescent labeling, or immobilization onto surfaces. This makes it valuable in the development of peptide-based drugs, biomaterials, and diagnostic probes. The lysine-like structure with dual amide linkages also supports the construction of branched peptides and peptidomimetics.