Used in peptide synthesis as a protective group for glutamic acid, ensuring selective reactions during the formation of peptide bonds. It is particularly valuable in solid-phase peptide synthesis (SPPS), where the Boc (tert-butyloxycarbonyl) group protects the amino group, and the OBzl (benzyl ester) group protects the carboxyl side chain of glutamic acid. This allows for controlled deprotection and coupling steps, enabling the synthesis of complex peptides with high precision. It is commonly applied in the production of pharmaceuticals, bioactive peptides, and research compounds, where precise amino acid sequence and functional group protection are critical.