You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-(3-fluoro-4-methoxyphenyl)ethyl]-6-(5-methylpyridin-2-yl)-N-phenyl-7,8-dihydro-5H-pyrido[4,3-d]pyrimidin-4-amine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C28H28FN5O
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