Used in peptide synthesis as a protected building block, particularly in the preparation of complex peptides where selective protection of functional groups is required. The Boc group protects the amino terminus, while the benzyl ester (OBzl) protects the carboxylic acid group of threonine, allowing stepwise assembly without unwanted side reactions. Commonly applied in solid-phase and solution-phase peptide synthesis for pharmaceutical research and development of bioactive peptides.