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![tert-butyl 3-Oxo-1-phenyl-2,7-diazaspiro[3.5]nonane-7-carboxylate](https://api.sigmaaldrich.com/deepweb/assets/sigmaaldrich/product/structures/381/896/aa793e4b-2179-43bd-be57-72ee71ccd5b5/640/aa793e4b-2179-43bd-be57-72ee71ccd5b5.png)