You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(2S,6R)-2,6-dimethylmorpholin-4-yl]-7-[(2-fluorophenyl)methyl]-3,5,6,8-tetrahydropyrido[3,4-d]pyrimidin-4-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H25FN4O2
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