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 [4-[(5-chloro-3-hydroxy-1H-indol-2-yl)sulfonyl]piperazin-1-yl]-(4-pyridin-4-ylphenyl)methanone;ethane is given. What is its corresponding molecular formula?
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C26H27ClN4O4S
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