You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named ethyl 1-[2-[2-[(5S,9R)-7,7,9-trimethyl-2,4-dioxo-1,3-diazaspiro[4.5]decan-3-yl]acetyl]oxyacetyl]piperidine-4-carboxylate by IUPAC nomenclature, provide its molecular formula.
user
C23H35N3O7
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