Used as a key intermediate in the synthesis of pharmaceuticals, particularly in the development of central nervous system (CNS) agents. Its spirocyclic structure and functional groups make it valuable for constructing complex nitrogen-containing heterocycles. Commonly employed in medicinal chemistry for structure-activity relationship (SAR) studies, especially in the design of receptor modulators. The tert-butyl and methyl ester groups allow for selective deprotection and further derivatization, enabling flexible synthetic routes in drug discovery.