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 (3S)-1-[1-[3-(trifluoromethoxy)phenyl]sulfonylpiperidine-4-carbonyl]piperidine-3-carboxylate is given. What is its corresponding molecular formula?
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C21H27F3N2O6S
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