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 (5E)-3-[2-(4-bromophenyl)-2-oxoethyl]-5-[(5-bromo-2-propoxyphenyl)methylidene]-1,3-thiazolidine-2,4-dione into molecular formula.
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C21H17Br2NO4S
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