You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-hydroxy-3-[(E)-3-methylbut-1-enyl]-4-[[4-[(E)-3-methylbut-1-enyl]-5-methylidene-2H-furan-3-yl]oxy]oxolan-2-one is the IUPAC name of a molecule. Please give its molecular formula.
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