You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (2E,9bR)-6-acetyl-7,9-dihydroxy-8,9b-dimethyl-2-[1-(2-phenoxyethylamino)ethylidene]dibenzofuran-1,3-dione into molecular formula.
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C26H25NO7
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