You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 3-chloro-N-(4-fluoro-1,3-benzothiazol-2-yl)-N-(furan-2-ylmethyl)-1-benzothiophene-2-carboxamide is given. What is its corresponding molecular formula?
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C21H12ClFN2O2S2
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