You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[3-fluoro-5-[2-[5-(4-methylpyridin-3-yl)-1H-pyrazolo[3,4-c]pyridin-3-yl]-3H-imidazo[4,5-c]pyridin-7-yl]phenyl]-N',N'-dimethylethane-1,2-diamine is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H26FN9
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