You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 5-(5,7-dihydroxy-9,13,16-trimethyl-15,17,20-trioxahexacyclo[14.3.1.114,18.01,13.04,12.05,9]henicosan-8-yl)pyran-2-one into molecular formula.
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C26H34O7
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