You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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3-(4-bromo-3,5-dimethylpyrazol-1-yl)-N-[1-[(3-fluorophenyl)methyl]pyrazol-4-yl]-2-methylpropanamide is the IUPAC name of a molecule. Please give its molecular formula.
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C19H21BrFN5O
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