You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[1-(3-fluoro-4-methylanilino)ethyl]-5,6-dimethyl-3H-thieno[2,3-d]pyrimidin-4-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C17H18FN3OS
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