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 (4S,5S)-4-(2,3-dihydroindole-1-carbonyl)-5-(1,5-dimethylpyrazol-4-yl)-1-ethylpyrrolidin-2-one is given. What is its corresponding molecular formula?
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C20H24N4O2
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