You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 5-[(5-bromo-2-methoxyphenyl)methylidene]-2-(4-prop-2-enoxyphenyl)-[1,3]thiazolo[3,2-b][1,2,4]triazol-6-one by IUPAC nomenclature, provide its molecular formula.
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C21H16BrN3O3S
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