You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (5R)-7-(2,2-dimethylpropyl)-2-[2-(4-methoxyphenyl)acetyl]-2,7-diazaspiro[4.5]decan-6-one into molecular formula.
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C22H32N2O3
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