You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule ethyl 5-acetyl-2-[[2-[[5-[(2-fluorophenoxy)methyl]-1,3,4-oxadiazol-2-yl]sulfanyl]acetyl]amino]-4-methylthiophene-3-carboxylate into molecular formula.
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C21H20FN3O6S2
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