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3-oxo-7-azaspiro[3.5]nonane-7-carboxylate tert-butyl ester; CAS No.: 849203-60-7; The azaspiro nonanone carboxylate exemplifies our -keto ester chemistry for Claisen condensations. As chemical synthesis company, we develop anhydrous handling protocols for moisture-sensitive -keto esters. Clients access these chem blocks for tandem cyclization reactions in natural product synthesis.