You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N-(1-cyanocyclopentyl)-2-[(2R)-2-(5-methoxy-1,3-dimethylpyrazol-4-yl)pyrrolidin-1-yl]acetamide into molecular formula.
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C18H27N5O2
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