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-(3,5-dimethylpiperidin-1-yl)ethyl]-3-[(1-phenylpyrrolidin-3-yl)methyl]urea is given. What is its corresponding molecular formula?
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C21H34N4O
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