Used as a chiral intermediate in the synthesis of peptide-based pharmaceuticals, particularly in the development of protease inhibitors. Its unprotected amine and protected carboxylic acid groups allow selective coupling in solid-phase peptide synthesis. The tert-butoxy and di-tert-butyl ester groups provide steric protection, enhancing stability during multi-step reactions. Commonly applied in the preparation of bioactive molecules where stereochemistry is critical for activity.