You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (6Z)-6-[[5-(3-chloro-4-methylphenyl)furan-2-yl]methylidene]-5-imino-3-(2-methylpropylsulfonyl)-[1,2,4]thiadiazolo[4,5-a]pyrimidin-7-one into its molecular formula.
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C21H19ClN4O4S2
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