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 (5Z)-5-[(4-chlorophenyl)methylidene]-3-(6-oxo-6-pyrrolidin-1-ylhexyl)-2-sulfanylidene-1,3-thiazolidin-4-one is given. What is its corresponding molecular formula?
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C20H23ClN2O2S2
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