Used as a protected amino acid derivative in peptide synthesis, particularly in solid-phase and solution-phase methods. The Boc (tert-butoxycarbonyl) group protects the amine functionality, while the methyl ester protects the carboxylic acid, and the O-methyl group stabilizes the serine side chain. This protection scheme allows for selective deprotection and coupling steps, making it valuable in the construction of complex peptides and peptidomimetics. Commonly employed in pharmaceutical research and development for synthesizing bioactive peptides with high purity and yield.