Used in peptide synthesis as a protected amino acid building block, particularly in solid-phase peptide synthesis (SPPS). The Fmoc group allows for orthogonal protection of the alpha-amino group, enabling stepwise assembly of peptides with mild base-labile deprotection. The tert-butoxycarbonyl (Boc) group protects the side-chain amine, making it suitable for incorporating asparagine or aspartic acid derivatives selectively. Its stereochemistry ensures chiral purity in the resulting peptide chain. Commonly employed in the preparation of complex peptides and proteins for pharmaceutical and biochemical research.