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 4-[3-[(5Z)-5-benzylidene-4-oxo-2-sulfanylidene-1,3-thiazolidin-3-yl]propanoylamino]-2-hydroxybenzoic acid is given. What is its corresponding molecular formula?
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C20H16N2O5S2
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