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 ethyl 4-[4-[4-amino-2-(trifluoromethyl)phenyl]piperazin-1-yl]sulfonylbenzoate is given. What is its corresponding molecular formula?
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C20H22F3N3O4S
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