You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 5-[(2S,4R,5R,6aR)-5-hydroxy-4-[(E,3S)-3-hydroxyoct-1-enyl]-3,3a,4,5,6,6a-hexahydro-2H-cyclopenta[b]furan-2-yl]pentanoic acid by IUPAC nomenclature, provide its molecular formula.
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C20H34O5
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