Used in peptide synthesis as a protecting group for aspartic acid. It helps prevent unwanted side reactions during the formation of peptide bonds. The Boc group protects the amino group, while the OtBu group protects the carboxyl group, ensuring selective reactions. This compound is particularly useful in solid-phase peptide synthesis, where controlled and stepwise assembly of peptides is required. It is also employed in the preparation of complex peptides and proteins for research and pharmaceutical applications.