You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5,6-diamino-8-(azepan-1-yl)-3-(4-fluorophenyl)-2-oxo-1H-pyrrolo[2,3-c][2,7]naphthyridine-9-carbonitrile The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H22FN7O
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