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Under IUPAC nomenclature, a molecule named (5Z)-5-[[2-(2-hydroxyethylsulfanyl)-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-[[(2R)-oxolan-2-yl]methyl]-2-sulfanylidene-1,3-thiazolidin-4-one is given. What is its corresponding molecular formula?
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C19H19N3O4S3
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