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-[6-amino-8-[[(5E,7Z)-7-ethynyl-9-methylidene-4H-1,3-dioxonin-6-yl]sulfanyl]purin-9-yl]-N-propan-2-ylpropane-1-sulfonamide is given. What is its corresponding molecular formula?
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C21H26N6O4S2
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