Used primarily as an intermediate in the synthesis of pharmaceutical compounds, particularly in the development of bioactive molecules and drug candidates. Its spirocyclic structure and functional groups make it valuable in medicinal chemistry for constructing complex heterocyclic systems. The Boc-protected amine and carboxylic acid functionalities allow for selective reactions, enabling stepwise assembly of peptides and peptidomimetics. It is also employed in the preparation of kinase inhibitors and central nervous system agents due to its conformational rigidity and favorable pharmacokinetic properties.