You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 7-(20,20-diphenyl-8-pentacyclo[11.7.1.02,7.09,21.014,19]henicosa-1(21),2,4,6,8,10,12,14,16,18-decaenyl)-9,9-dimethylfluorene-2-carbonitrile .
user
C49H33N
assistant