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-(3-ethoxypropyl)-2,4,7,8-tetramethylpurino[7,8-a]imidazole-1,3-dione is given. What is its corresponding molecular formula?
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C16H23N5O3
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