This chemical is widely used in peptide synthesis as a protecting group for D-glutamic acid residues. It helps prevent unwanted side reactions during the formation of peptide bonds, ensuring the desired sequence is achieved. The Boc (tert-butyloxycarbonyl) group protects the amino group, while the OtBu (tert-butyl ester) group protects the side-chain carboxyl group, allowing selective deprotection when needed. It is particularly valuable in solid-phase peptide synthesis (SPPS) and the production of complex peptides for pharmaceutical research, such as in the development of therapeutic peptides or peptide-based drugs. Its stability under various reaction conditions makes it a reliable choice for synthesizing peptides with high precision.