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 2-(3-chlorophenyl)-4-cyclopentyloxy-5-[4-(2-phenylethenylsulfonyl)piperazin-1-yl]pyridazin-3-one is given. What is its corresponding molecular formula?
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C27H29ClN4O4S
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