You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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5-[1-[[5-(3-bromophenyl)-1H-pyrazol-4-yl]methyl]pyrrolidin-2-yl]-3-propan-2-yl-1,2-oxazole is the IUPAC name of a molecule. Please give its molecular formula.
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C20H23BrN4O
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