You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule 3,5-dichloro-N-[4-[(2,6-dimethylpyrimidin-4-yl)sulfamoyl]phenyl]-4-methoxybenzamide into molecular formula.
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C20H18Cl2N4O4S
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