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 8-[(5-bromo-2-hydroxy-1H-indol-3-yl)diazenyl]-7-hexyl-3-methyl-4,5-dihydropurine-2,6-dione is given. What is its corresponding molecular formula?
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C20H24BrN7O3
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