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-oxo-1,3-dihydroindol-5-yl)methyl]-3-[(2-phenylcyclopropyl)methyl]urea is given. What is its corresponding molecular formula?
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C20H21N3O2
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