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 3-[6-chloro-3-[(3-chlorophenyl)methyl]-2-oxo-1H-indol-3-yl]-N-ethylpiperidine-1-carboxamide is given. What is its corresponding molecular formula?
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C23H25Cl2N3O2
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