Used as a protected amino acid building block in peptide synthesis, enabling selective coupling reactions without side chain interference. The Boc group provides temporary protection for the amine functionality, while the benzyl ester masks the carboxylic acid, allowing stepwise assembly of complex peptides. Commonly employed in solid-phase and solution-phase synthesis for pharmaceuticals and bioactive peptides. Stable under a range of reaction conditions, it facilitates high yields and purity in final products.