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![3-Oxo-7-azaspiro[3.5]nonane-7-carboxylate tert-butyl ester](https://api.sigmaaldrich.com/deepweb/assets/sigmaaldrich/product/structures/297/253/55fe7a33-159b-4416-95b4-318d7ed68de1/640/55fe7a33-159b-4416-95b4-318d7ed68de1.png)