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 N-[(2-chlorophenyl)methyl]-1-[2-(cyclohexen-1-yl)ethyl]-5-oxopyrrolidine-3-carboxamide is given. What is its corresponding molecular formula?
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C20H25ClN2O2
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