You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule [(9S,10S,11S)-3,4,5,19-tetramethoxy-9,10-dimethyl-8-oxo-15,17-dioxatetracyclo[10.7.0.02,7.014,18]nonadeca-1(19),2,4,6,12,14(18)-hexaen-11-yl] acetate into molecular formula.
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C25H28O9
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