Used as a chiral building block in the synthesis of biologically active compounds, particularly in pharmaceutical research. Its rigid indeno-oxathiazole scaffold with defined stereochemistry makes it valuable for asymmetric synthesis and development of enzyme inhibitors. Commonly employed in medicinal chemistry for structure-activity relationship studies, especially in protease or kinase inhibitor programs. The tert-butyl carbamate-protected structure allows for selective deprotection and further functionalization, enabling its use in multi-step synthetic routes for drug candidates.