Used in peptide synthesis as a protected amino acid building block. The Boc group protects the amine functionality, while the tert-butyl group protects the side chain hydroxyl group of serine. This dual protection allows selective deprotection and coupling in solid-phase or solution-phase peptide synthesis. Commonly employed in the preparation of complex peptides and proteins, especially where stereochemical control is important due to the D-configuration. Also used in the synthesis of peptidomimetics and pharmaceutical intermediates. Stable under a variety of reaction conditions, making it suitable for multi-step syntheses.