You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 4'-[3-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl]-2,3-bis(ethenyl)spiro[indene-1,11'-indolo[1,2-a]benzimidazole] into molecular formula.
user
C47H31N5
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