Used in peptide synthesis as a protected amino acid derivative, ensuring specific side chains remain intact during the reaction process. It is particularly valuable in solid-phase peptide synthesis (SPPS) for constructing complex peptides. The Boc group provides temporary protection for the amino group, while the pMeBzl group safeguards the thiol functionality of penicillamine. This compound is essential in producing peptides with precise sequences, especially in pharmaceutical research and drug development. Its application extends to creating peptide-based therapeutics, enzyme inhibitors, and biomaterials.