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 N-(3-bromophenyl)-5-(4-bromophenyl)-1-(3,4-dichlorophenyl)-1,2,4-triazole-3-carboxamide is given. What is its corresponding molecular formula?
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C21H12Br2Cl2N4O
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