Used as a protected amino acid derivative in peptide synthesis, particularly in the preparation of complex peptides where selective protection of functional groups is required. The Boc (tert-butoxycarbonyl) group provides temporary protection of the alpha-amino group, while the gamma-methyl ester masks the side chain carboxylic acid of glutamic acid, allowing stepwise assembly of peptides without unwanted side reactions. Its D-configuration makes it suitable for synthesizing peptides with specific stereochemical requirements, such as those used in medicinal chemistry and biochemical research. Commonly employed in solid-phase and solution-phase peptide coupling strategies.