You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 6-(difluoromethyl)-8-[(1R,3S)-3-hydroxycyclopentyl]-2-[(1-methylsulfonylpiperidin-4-yl)amino]pyrido[2,3-d]pyrimidin-7-one .
user
C19H25F2N5O4S
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