You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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(6S,7S)-3-cyclohexyl-6-fluoro-7-(2-fluoro-5-methylphenyl)-1,2,5,6,7,8-hexahydropyrido[2,3-d]pyrimidin-4-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H25F2N3O
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