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 N-[(3R)-1,1-dioxothiolan-3-yl]-N-(furan-2-ylmethyl)-6,7-dimethyl-4-oxochromene-2-carboxamide is given. What is its corresponding molecular formula?
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C21H21NO6S
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