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 2-[[(1S)-2-methyl-1-(3-methyl-1-benzofuran-2-yl)propyl]amino]-N-(oxan-4-yl)acetamide is given. What is its corresponding molecular formula?
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C20H28N2O3
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