Used in peptide synthesis as a protected amino acid derivative, particularly in the construction of complex peptides where selective protection of side-chain functional groups is required. The methyl ester group provides protection for the carboxylic acid functionality, allowing controlled coupling reactions. Commonly employed in solid-phase and solution-phase synthesis of bioactive peptides, including hormones and enzyme inhibitors. Its protected form helps prevent unwanted side reactions during stepwise assembly of peptide chains. Also utilized in the preparation of glycopeptides and other biologically active molecules requiring precise stereochemical control.