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-(furan-2-carbonyl)piperidin-4-yl]-4-(2,2,2-trifluoroethyl)-1,4-diazepane-1-carboxamide into molecular formula.
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C18H25F3N4O3
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