Used as an intermediate in the synthesis of pharmaceutical compounds, particularly beta-lactam antibiotics such as penicillins and cephalosporins. Its spirocyclic structure and tert-butyl protected carboxylate group enable precise control of chemical reactions during ring formation and functionalization, especially in creating carbon-carbon or carbon-sulfur bonds. This compound is crucial for synthesizing molecules with chiral centers requiring high purity, supporting the development of effective antibiotics.