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2,9-dioxa-6-azaspiro[3.5]nonane-6-carboxylic acid tert-butyl ester; CAS No.: 1272412-69-7; This 2,9-dioxa-6-azaspiro[3.5]nonane derivative showcases our oxygen-rich heterocycles for solubility-driven drug design. As custom synthesis companies, we implement phase-transfer catalysis for efficient macrocyclization. Clients access these building blocks for drug discovery through our catalog and custom synthesis services with optional PEGylation.