You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-(2,4-difluorophenoxy)-2-[4-(hydroxymethyl)piperidin-1-yl]-8-methylpyrido[2,3-d]pyrimidin-7-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H20F2N4O3
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