You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 2,3,3a,4,5,6,7,7a-octahydro-1H-indol-2-yl-[3-(1-methylpyrazol-4-yl)pyrrolidin-1-yl]methanone by IUPAC nomenclature, provide its molecular formula.
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C17H26N4O
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