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 6-[2-[[5-(2-methylfuran-3-yl)-4-prop-2-enyl-1,2,4-triazol-3-yl]sulfanyl]propanoyl]-4H-1,4-benzoxazin-3-one is given. What is its corresponding molecular formula?
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C21H20N4O4S
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