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 9-(7a-methyl-2-oxo-2-propan-2-yloxy-4,4a,6,7-tetrahydrofuro[3,2-d][1,3,2]dioxaphosphinin-6-yl)-6-ethoxypurin-2-amine is given. What is its corresponding molecular formula?
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C16H24N5O6P
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