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-[2-(diethylamino)-2-(furan-2-yl)ethyl]-N'-methyl-4-(1-methylpyrazol-4-yl)-3-oxopiperazine-1-carboximidamide into molecular formula.
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C20H31N7O2
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