Used as a key intermediate in the synthesis of pharmaceutical compounds, particularly in the development of bioactive molecules and drug candidates. Its aldehyde functionality allows for versatile chemical modifications, such as reductive amination or condensation reactions, enabling the introduction of diverse substituents. The spirocyclic structure contributes to conformational rigidity, which is beneficial in designing molecules with enhanced selectivity and metabolic stability. Commonly employed in medicinal chemistry for constructing complex nitrogen-containing heterocycles.