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3-oxa-9-azaspiro[5.5]undecane-9-carboxylic acid tert-butyl ester; CAS No.: 1259489-90-1; This oxa-azaspiro undecane derivative demonstrates our large-ring heterocycles for ion channel blockers. As Leading Chemicals Distributor, we provide custom salt screening for improved aqueous solubility. Clients utilize these building blocks through custom synthesis services with patch clamp assay support.