You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 4-[[4-[3-fluoro-4-[(4-oxo-2-sulfanylidene-1,3-thiazolidin-5-yl)methyl]phenoxy]phenyl]methyl]-1,3-oxazolidin-2-one by IUPAC nomenclature, provide its molecular formula.
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C20H17FN2O4S2
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