Used in peptide synthesis as a protected amino acid derivative, enabling selective coupling and preventing unwanted side reactions. The Boc group provides temporary protection for the amine functionality, while the Obzl ester masks the carboxylic acid, allowing stepwise assembly of complex peptides. Commonly applied in solid-phase and solution-phase synthesis for pharmaceuticals and bioactive compounds. Stable under a range of conditions, yet removable under mild acidic or hydrogenolytic conditions, making it suitable for multi-step synthetic strategies.