You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[2-chloro-8-[(2-fluorophenyl)methylsulfanyl]pyrimido[5,4-d]pyrimidin-4-yl]-1,4-thiazinane 1-oxide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H15ClFN5OS2
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