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-methoxyphenyl)methyl]-3-[1-(6-methylpyridine-3-carbonyl)piperidin-4-yl]urea is given. What is its corresponding molecular formula?
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C21H26N4O3
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