You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named [3,12-diethyl-12-(hydroxymethyl)-8-methyl-16-methylidene-1,5,10,14-tetraoxadispiro[5.2.59.26]hexadecan-3-yl]methanol by IUPAC nomenclature, provide its molecular formula.
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C20H34O6
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