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-(2,6-dioxaspiro[4.5]decan-9-yl)-3-[(1R)-1-(3-methyl-1-benzofuran-2-yl)ethyl]urea is given. What is its corresponding molecular formula?
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C20H26N2O4
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