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system
Name the molecular formula for the molecule established as 6-[[3-ethoxy-4-[(4-fluorophenyl)methoxy]phenyl]methylidene]-2-ethyl-5-imino-[1,3,4]thiadiazolo[3,2-a]pyrimidin-7-one using the IUPAC nomenclature.
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C23H21FN4O3S
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