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-amino-9-[5-(oxan-4-ylamino)pentyl]-2-[(2S)-pentan-2-yl]oxy-7H-purin-8-one is given. What is its corresponding molecular formula?
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C20H34N6O3
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