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 1-[4-(3-chlorophenyl)piperazin-1-yl]-2-[5-[3-(trifluoromethyl)phenyl]tetrazol-2-yl]ethanone is given. What is its corresponding molecular formula?
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C20H18ClF3N6O
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