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 2-(2,3-dihydro-1H-inden-2-yl)-1-[2-(pyridine-3-carbonyl)pyrazolidin-1-yl]ethanone is given. What is its corresponding molecular formula?
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C20H21N3O2
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