You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 4-[6-amino-5-cyano-4-(5-ethyl-1H-pyrazol-3-yl)pyridin-2-yl]-5-methylfuran-2-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H17N5O3
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