Used in peptide synthesis as a protected amino acid derivative, enabling selective coupling reactions while preventing side reactions at the aspartic acid side chain. The Boc group protects the alpha-amino functionality, and the methyl ester masks the side chain carboxylic acid, allowing controlled deprotection and elongation of peptide chains. Commonly applied in the preparation of complex peptides and peptidomimetics for pharmaceutical research. Suitable for solid-phase and solution-phase synthesis, particularly where stereochemical integrity of D-aspartic acid is required.