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 3-(4-chlorophenyl)-1-(4-ethylpiperazin-1-yl)-3-(5-nitro-1H-indol-3-yl)propan-1-one is given. What is its corresponding molecular formula?
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C23H25ClN4O3
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