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1-oxa-6-azaspiro[3.4]octane-6-carboxylyic acid tert-butyl ester; CAS No.: 1264635-65-5; ChemShuttle s oxa-azaspiro octane carboxylate serves as building block for prodrug esterases. As custom synthesis companies, we optimize enzymatic hydrolysis rates through substituent tuning. These chem blocks enable targeted tissue delivery in antiviral drug development programs.