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 N-(2-ethoxyphenyl)-2-[1-(4-methylphenyl)-4-oxopyrazolo[3,4-d]pyrimidin-5-yl]acetamide is given. What is its corresponding molecular formula?
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C22H21N5O3
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