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 1-[[4-[[(3-propan-2-yloxypyrazin-2-yl)amino]methyl]phenyl]methyl]pyridin-2-one is given. What is its corresponding molecular formula?
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C20H22N4O2
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