Used as a key intermediate in the synthesis of pharmaceutical compounds, particularly in the development of kinase inhibitors and other biologically active molecules. Its spirocyclic structure and functional groups allow for selective modifications, making it valuable in medicinal chemistry for building complex heterocyclic systems. Commonly employed in peptide-like backbone construction and prodrug design due to the presence of the Boc-protected amine and carboxylic acid functionalities. Also utilized in combinatorial chemistry and library synthesis for drug discovery.