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-(9,9-dimethylfluoren-2-yl)-4-[4-(9,9-diphenylxanthen-4-yl)phenyl]-6-(4-isocyanophenyl)-1,3,5-triazine using the IUPAC nomenclature.
user
C56H38N4O
assistant