You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-[4-(1H-indole-2-carbonyl)piperazin-1-yl]-2-(methylamino)-2-(1-methylpyrazol-4-yl)ethanone into its molecular formula.
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C20H24N6O2
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