Used in peptide synthesis as a protected amino acid derivative, particularly in the preparation of aspartic acid-containing peptides. The benzyloxy (OBzl) group acts as a side-chain protecting group, preventing unwanted reactions during coupling steps. Commonly employed in the synthesis of complex biomolecules, including pharmaceuticals and enzyme inhibitors, where selective deprotection and chain elongation are required. Its Z (benzyloxycarbonyl) group on the alpha-amine allows for orthogonal protection strategies in solid-phase and solution-phase peptide synthesis.