Used as a key chiral intermediate in the synthesis of pharmaceutical agents, particularly in the development of protease inhibitors and other bioactive molecules. Its spirocyclic structure and functional groups, including the tert-butoxycarbonyl (Boc) protecting group and carboxylic acid, allow for selective transformations, making it valuable in constructing complex drug scaffolds. Commonly employed in medicinal chemistry for optimizing potency and metabolic stability in drug candidates.