You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 2-[4-[[3-(6-amino-2-butoxy-8-oxo-7H-purin-9-yl)propyl-[2-[(2R)-2-carbamoylpyrrolidin-1-yl]acetyl]amino]methyl]phenyl]acetic acid by IUPAC nomenclature, provide its molecular formula.
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C28H38N8O6
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