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 2-[4-(2,6-ditert-butylpyridin-3-yl)phenyl]-4-phenyl-6-spiro[fluorene-9,9'-xanthene]-2'-yl-1,3,5-triazine into molecular formula.
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C53H44N4O
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