You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 4-[[(5E)-5-[(3-hydroxy-4-methoxyphenyl)methylidene]-3-methyl-4-oxo-1,3-thiazolidin-2-ylidene]amino]benzoic acid by IUPAC nomenclature, provide its molecular formula.
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C19H16N2O5S
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