Used in peptide synthesis as a protected amino acid derivative, particularly in solid-phase peptide synthesis (SPPS). The Fmoc group provides temporary protection for the amino terminus, allowing stepwise assembly of peptides with precise sequence control. The azido group at the sixth position serves as a precursor for click chemistry reactions, enabling bioconjugation or labeling after peptide assembly. Its branched methyl group introduces steric features useful in designing structured or stabilized peptides. Commonly applied in research settings for developing bioactive peptides, probes, and protein mimetics.