Used in peptide synthesis and bioconjugation applications, particularly in click chemistry. The azide group enables copper-catalyzed azide-alkyne cycloaddition (CuAAC) reactions, allowing site-specific labeling or attachment of peptides to fluorophores, polymers, or solid supports. The Fmoc group provides orthogonal protection for the alpha-amine, making it compatible with standard solid-phase peptide synthesis (SPPS). The (R)-configuration supports studies requiring stereochemical control, such as in the development of constrained or structured peptides. Commonly used in chemical biology and drug discovery for constructing peptide-based probes or bioconjugates.