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1-oxa-7-azaspiro[3.5]nonane-7-carboxylic acid tert-butyl ester; CAS No.: 864684-96-8; ChemShuttle s oxa-azaspiro nonane carboxylate serves as key intermediate for macrocyclic HCV inhibitors. Our custom chemical synthesis services employ high-dilution techniques for strain-free cyclizations. Clients access these building blocks for drug discovery through catalog and made-to-order synthesis options.