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 N'-methyl-N-[3-methyl-2-(4-methylpiperazin-1-yl)butyl]-2,3-dihydroindole-1-carboximidamide is given. What is its corresponding molecular formula?
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C20H33N5
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