You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 11'-(3-carbazol-9-ylcyclohexa-2,4-dien-1-yl)spiro[12H-indeno[1,2-a]carbazole-7,12'-indeno[2,1-a]carbazole] .
user
C55H35N3
assistant