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-[1-[5-(4-chlorophenyl)-3-(furan-2-yl)-3,4-dihydropyrazol-2-yl]-1-oxopropan-2-yl]pyrrolidine-2-carboxamide is given. What is its corresponding molecular formula?
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C21H23ClN4O3
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