Used in peptide synthesis as a protected amino acid derivative, particularly in the preparation of complex peptides where selective deprotection and coupling are required. The Z (benzyloxycarbonyl) group serves as an amine-protecting group, while the Obzl (benzyl ester) protects the carboxylic acid functionality. This dual protection allows stepwise assembly of peptide chains with high purity and yield. Commonly employed in both solid-phase and solution-phase synthesis strategies. Also utilized in the production of pharmaceutical intermediates and bioactive peptides due to its stability under various reaction conditions and ease of removal via hydrogenolysis.