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 9-(3,5-diphenylphenyl)-3-[21-(4,6-diphenyl-1,3,5-triazin-2-yl)spiro[pentacyclo[11.8.0.02,10.03,8.014,19]henicosa-1(13),2(10),3,5,7,11,14(19),15,17-nonaene-9,9'-xanthene]-16-yl]carbazole is given. What is its corresponding molecular formula?
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C78H50N4O
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