You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 6,8-dimethyl-1'-[3-(2-methylpropoxy)benzoyl]spiro[3H-chromene-2,4'-piperidine]-4-one is given. What is its corresponding molecular formula?
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C26H31NO4
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