You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-[[1-(4-fluorophenyl)pyrazolo[3,4-d]pyrimidin-4-yl]sulfanylmethyl]-1,3-dimethylpyrimidine-2,4-dione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H15FN6O2S
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