You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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2-fluoro-N-[[4-(5-pyrazin-2-yl-1,3,4-oxadiazol-2-yl)cyclohexyl]methyl]benzamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H20FN5O2
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