You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[(2,3-difluorophenyl)methylsulfanyl]-4-[2-hydroxyethyl(methyl)amino]-8H-pteridin-7-one by IUPAC nomenclature, provide its molecular formula.
user
C16H15F2N5O2S
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