You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(4-bromo-2,6-dichlorophenyl)-4-[chloro(difluoro)methyl]sulfanylpyrrole-3-carbonitrile is the IUPAC name of a molecule. Please give its molecular formula.
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C12H4BrCl3F2N2S
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