You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-fluoro-6-[8-oxo-1-[2-(2-oxopyrrolidin-1-yl)acetyl]-1,4,7-triazecan-4-yl]benzonitrile is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H24FN5O3
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