Used as a key intermediate in the synthesis of pharmaceutical compounds, particularly in the development of protease inhibitors and other bioactive molecules. Its spirocyclic structure and functional groups make it valuable for constructing complex heterocyclic systems in medicinal chemistry. Commonly employed in peptide mimetics and drug design where conformational restraint is needed to enhance metabolic stability and receptor selectivity. Also utilized in solid-phase synthesis and combinatorial chemistry for generating compound libraries aimed at drug discovery.