You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule 1-(3-amino-4-chlorophenyl)-1-[4-(1H-pyrrolo[2,3-b]pyridin-3-yl)piperidin-1-yl]ethanol into molecular formula.
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C20H23ClN4O
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