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3-hydroxy-1-oxa-8-azaspiro[4.5]decane-8-carboxylic acid tert-butyl ester; CAS No.: 240401-09-6; This oxa-azaspirodecane derivative demonstrates our oxygen-nitrogen heterocycles for macrocyclic antibiotic cores. The chemical online store features spirocyclic ethers with pre-installed ketone handles for reductive amination. Clients access these building blocks through custom synthesis services with strict residual solvent controls.