Used as an intermediate in the synthesis of pharmaceutical compounds, particularly in the development of cysteine protease inhibitors. Its spirocyclic structure and functional groups make it valuable for constructing complex molecules with biological activity. Commonly employed in medicinal chemistry for optimizing drug candidates targeting inflammatory diseases and certain viral infections. The tert-butyl carbamate (Boc) group allows for easy protection of amines during multi-step syntheses, enhancing selectivity and yield in peptide-like frameworks.