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-(4-butylpiperazin-1-yl)-3-fluorophenyl]iminomethyl]-1,3-dihydroindol-2-one is given. What is its corresponding molecular formula?
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C23H27FN4O
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