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Name the molecular formula for the molecule established as 5-[6,6-difluoro-5-hydroxy-4-(3-hydroxyoct-1-enyl)-3a,4,5,6a-tetrahydro-3H-cyclopenta[b]furan-2-ylidene]-2,2-difluoropentanoic acid using the IUPAC nomenclature.
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C20H28F4O5
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