Used as a key intermediate in the synthesis of pharmaceuticals, particularly in the development of kinase inhibitors and central nervous system (CNS) agents. Its spirocyclic structure and tert-butyl carboxylate group provide conformational rigidity and protecting functionality, enhancing selectivity, metabolic stability, and ease of synthetic modification in drug candidates. Commonly employed in medicinal chemistry for structure-activity relationship (SAR) studies due to its ability to modulate bioavailability and binding affinity. Also utilized in the preparation of protease inhibitors and receptor antagonists in research settings.