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 [[(2R)-1-(6-aminopurin-9-yl)but-3-en-2-yl]oxymethyl-(propan-2-yloxycarbonyloxymethoxy)phosphoryl]oxymethyl propan-2-yl carbonate is given. What is its corresponding molecular formula?
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C20H30N5O10P
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