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 (3R)-N-[2-[4-(4-chlorophenyl)-5-(1-methylimidazol-2-yl)pyrazol-1-yl]ethyl]-1-methyl-5-oxopyrrolidine-3-carboxamide is given. What is its corresponding molecular formula?
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C21H23ClN6O2
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