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Name the molecular formula for the molecule established as 6-[[5-(4-chlorophenyl)furan-2-yl]methylidene]-5-imino-2-(2-methylphenyl)-[1,3,4]thiadiazolo[3,2-a]pyrimidin-7-one using the IUPAC nomenclature.
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C23H15ClN4O2S
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