Used as a chiral building block in the synthesis of pharmaceutical intermediates, particularly in the development of protease inhibitors and other bioactive molecules. Its protected amine group and carboxylic acid functionality allow for selective coupling reactions in peptide-based drug synthesis. The D-configuration and chlorinated aromatic side chain make it valuable for introducing steric and electronic features that influence biological activity. Commonly employed in multi-step organic syntheses where stereochemical control is critical.