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 5-[(E)-2-(4-fluorophenyl)ethenyl]-4-[(2S,4S,6S)-4-hydroxy-6-(hydroxymethyl)oxan-2-yl]oxybenzene-1,3-diol is given. What is its corresponding molecular formula?
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C20H21FO6
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