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 1-[6-chloro-1-(1H-indol-3-yl)-1,3,4,9-tetrahydropyrido[3,4-b]indol-2-yl]butan-1-one is given. What is its corresponding molecular formula?
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C23H22ClN3O
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