You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4R)-4-(2-bromophenyl)-1-phenyl-5,7-dihydro-4H-pyrazolo[3,4-b]pyridin-6-one The above is the IUPAC name of a molecule. Write its molecular formula.
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C18H14BrN3O
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