You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as 4-[4-(3-chloro-6-fluoro-1-benzothiophene-2-carbonyl)piperazin-1-yl]sulfonylbenzonitrile using the IUPAC nomenclature.
user
C20H15ClFN3O3S2
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