You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 2-[5-[2-(4-bromo-2,6-dimethylanilino)-2-oxoethyl]sulfanyl-4-methyl-1,2,4-triazol-3-yl]-N-(3,4-dichlorophenyl)acetamide is given. What is its corresponding molecular formula?
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C21H20BrCl2N5O2S
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