You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-[3-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl]-6-phenylspiro[chromeno[3,2-k]phenanthridine-9,9'-fluorene] into its molecular formula.
user
C59H36N4O
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