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system
Name the molecular formula for the molecule established as 2-[4-[5-[(2-ethyl-2-bicyclo[2.2.1]heptanyl)oxycarbonyl]-2-oxooxolan-3-yl]oxy-4-oxobutanoyl]oxy-1,1-difluoropropane-1-sulfonic acid using the IUPAC nomenclature.
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C21H28F2O11S
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