You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[(2S)-2-amino-3-(2-fluorophenyl)propyl]amino]-3,5-dimethyl-6-pyridin-4-ylpyrimidin-4-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H22FN5O
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