Used as a chiral building block in the synthesis of pharmaceuticals, particularly in the development of protease inhibitors and other biologically active molecules. Its stereochemistry and functional groups make it valuable in peptide mimetics and drug design where specific three-dimensional structure is critical. Commonly employed in solid-phase and solution-phase peptide synthesis to introduce modified amino acid residues. The Boc-protected amine and free carboxylic acid allow for selective coupling reactions, enabling controlled stepwise assembly of complex molecules. Widely utilized in research and industrial settings for the preparation of intermediates in active pharmaceutical ingredients (APIs).