You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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(3R)-1-(6-bromo-1H-indazol-3-yl)-5-oxo-N-(pyridin-2-ylmethyl)pyrrolidine-3-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
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C18H16BrN5O2
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