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1-oxa-6-azaspiro[3.3]heptane-6-carboxylic acid tert-butyl ester; CAS No.: 1223573-41-8; Featuring compact spiro architecture, this oxa-azaspiroheptane serves as building block for inhaled drug formulations. Our Leading Chemicals Distributor network ensures global logistics of low-melting-point solids. The company s Small molecules synthesis expertise includes micronization for dry powder inhaler compatibility.