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For the molecule named 2-ethoxy-4-[1,1,2,2-tetrafluoro-2-(1,1,2,2-tetrafluoro-2-iodoethoxy)ethyl]sulfonyl-1-oxa-4-azaspiro[4.4]nonane by IUPAC nomenclature, provide its molecular formula.
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C13H16F8INO5S
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