You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 4-[5-[[5-nitro-2-[4-(trifluoromethyl)phenoxy]phenyl]methylidene]-4-oxo-2-sulfanylidene-1,3-thiazolidin-3-yl]butanoic acid into molecular formula.
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C21H15F3N2O6S2
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