You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (4S)-1-(4-fluorophenyl)-4-(2-propan-2-yloxyphenyl)-5,7-dihydro-4H-pyrazolo[3,4-b]pyridin-6-one .
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C21H20FN3O2
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