Used in peptide synthesis as a protected amino acid building block, particularly in the preparation of complex peptides and peptidomimetics. The Boc group provides temporary protection for the amine functionality, while the methyl ester protects the carboxylic acid, allowing selective coupling reactions. The N-methyl and D-configuration enhance metabolic stability and influence conformational rigidity in the final peptide structure. Commonly applied in pharmaceutical research, especially in the development of bioactive peptides with improved resistance to enzymatic degradation.