You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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1-[4-bromo-1-[(2-chlorophenyl)methyl]pyrazol-3-yl]-3-[(1,3-dimethylpyrazol-4-yl)methyl]thiourea is the IUPAC name of a molecule. Please give its molecular formula.
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C17H18BrClN6S
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