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Under IUPAC nomenclature, a molecule named (5Z)-5-[[3-ethoxy-5-iodo-4-(2-oxo-2-pyrrolidin-1-ylethoxy)phenyl]methylidene]-3-propan-2-yl-2-sulfanylidene-1,3-thiazolidin-4-one is given. What is its corresponding molecular formula?
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C21H25IN2O4S2
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