You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-[7-(4,6-diphenyl-1,3,5-triazin-2-yl)-9,9-dimethylfluoren-2-yl]-1,2,3-triphenyl-1,3,2lambda5-benzodiazaphosphole 2-oxide is the IUPAC name of a molecule. Please give its molecular formula.
user
C54H40N5OP
assistant