Used in bioconjugation and peptide synthesis, particularly in click chemistry applications. The endo-BCN group enables copper-free azide-alkyne cycloaddition, making it ideal for labeling biomolecules in living systems without cytotoxic effects. The Fmoc-L-Lysine moiety allows for solid-phase peptide synthesis, where the Fmoc group provides orthogonal protection for stepwise peptide chain assembly. This compound is especially valuable in developing peptide-based probes, drug conjugates, and functionalized biomaterials where site-specific modification and biocompatibility are critical.