Used as a protected amino acid derivative in peptide synthesis, particularly in solid-phase and solution-phase methods. The Boc (tert-butoxycarbonyl) group provides temporary N-terminal protection, while the allyl ester protects the carboxylic acid functionality, allowing selective deprotection under mild conditions without affecting other sensitive groups. The DCHA (dicyclohexylamine) salt form improves crystallinity and handling properties. Commonly employed in the synthesis of complex peptides and glycopeptides where stereochemical integrity and orthogonal protection are critical. The allyl group can be cleanly removed using palladium catalysts, making it compatible with a wide range of coupling strategies and automated synthesis protocols.