You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named N-(4-dibenzofuran-4-ylphenyl)-N-(4-phenylphenyl)spiro[fluorene-9,7'-fluoreno[2,3-b][1]benzofuran]-1-amine is given. What is its corresponding molecular formula?
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