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system
Name the molecular formula for the molecule established as (5Z)-3-[(2-chloro-6-fluorophenyl)methyl]-5-[[5-(4-chlorophenyl)sulfanylthiophen-2-yl]methylidene]-1,3-thiazolidine-2,4-dione using the IUPAC nomenclature.
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C21H12Cl2FNO2S3
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