Used as a chiral building block in the synthesis of pharmaceutical intermediates, particularly in the development of protease inhibitors and other bioactive molecules. Its ortho-nitrophenyl group facilitates spectroscopic monitoring during coupling reactions, while the Boc-protected amine allows for controlled deprotection and further functionalization in peptide-like sequences. Commonly employed in asymmetric synthesis and solid-phase peptide synthesis due to its stereochemical purity and functional group compatibility.