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 5-[(1R)-4,5-dimethoxy-3-oxo-1H-2-benzofuran-1-yl]-6-hydroxy-1-(2-methoxyphenyl)-2-sulfanylidenepyrimidin-4-one is given. What is its corresponding molecular formula?
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C21H18N2O7S
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