You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4S)-4-(2-fluorophenyl)-1-(6-methoxy-1,3-benzothiazol-2-yl)-3-methyl-5,7-dihydro-4H-pyrazolo[3,4-b]pyridin-6-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H17FN4O2S
assistant