You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (2S,3R)-3-[5-(2-fluoro-4-methylphenyl)pyridin-2-yl]oxy-2-methyl-1-azabicyclo[2.2.2]octane into its molecular formula.
user
C20H23FN2O
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