Used as an intermediate in peptide synthesis, particularly in the protection of amino groups during the stepwise construction of peptides. The carbobenzoxy (Cbz) group prevents unwanted reactions at the amino site, allowing selective activation of the carboxylic acid for amide bond formation. After the desired peptide linkage is formed, the Cbz group can be removed by catalytic hydrogenation or acidolysis, making it a versatile protecting group in organic and medicinal chemistry. Commonly employed in the synthesis of complex bioactive molecules and pharmaceuticals where controlled coupling is essential.