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 6-[7-[4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl]spiro[fluorene-9,9'-xanthene]-2-yl]-4-(4-phenylphenyl)-2-spiro[fluorene-9,9'-xanthene]-2-ylquinazoline into molecular formula.
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C91H55N5O2
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