You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as 2-(7,7-dimethyl-5-phenylindeno[2,1-b]carbazol-2-yl)spiro[fluorene-9,11'-indolo[1,2-a]benzimidazole] using the IUPAC nomenclature.
user
C53H35N3
assistant