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 8-[(2R)-butan-2-yl]-3-(2,3-dihydro-1H-inden-2-yl)-1-ethyl-1,3,8-triazaspiro[4.5]decane-2,4-dione is given. What is its corresponding molecular formula?
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C22H31N3O2
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