Used in solid-phase peptide synthesis as a protected amino acid building block, particularly for incorporating asparagine residues with orthogonal protection. The Fmoc group allows for base-labile protection of the alpha-amine, while the methylamide on the side chain prevents unwanted side reactions during coupling steps. Enables the synthesis of complex peptides with high purity and reduced risk of aspartimide formation. Commonly applied in the preparation of therapeutic peptides, peptide hormones, and research reagents where precise sequence control is critical.