Used in peptide synthesis as a protected amino acid derivative, particularly in the preparation of pharmaceutical intermediates. The Boc (tert-butoxycarbonyl) group provides temporary protection for the amine function, allowing selective reaction at the carboxylic acid site. The 4-methoxyphenyl moiety adds stability and influences solubility, making it useful in solid-phase and solution-phase synthesis. Commonly employed in the development of bioactive molecules, including enzyme inhibitors and receptor ligands.