Used as an intermediate in peptide synthesis, particularly in the protection of amino groups during the preparation of complex peptides. Its tert-butoxycarbonyl (Boc) group helps prevent unwanted side reactions by blocking the amine functionality, while the chloromethyl ester allows for controlled esterification or further coupling reactions. Commonly employed in solid-phase peptide synthesis and in the development of pharmaceuticals where precise sequence assembly is required. Also useful in the preparation of peptide-based prodrugs and in modifying peptide stability and solubility.