You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-fluoro-6-(triazol-2-yl)phenyl]-[(1R,6S)-8-(6-methylpyrazin-2-yl)-3,8-diazabicyclo[4.2.0]octan-3-yl]methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H20FN7O
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