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 19-(9,9-dimethylfluoren-1-yl)-21-(4,6-diphenyl-1,3,5-triazin-2-yl)-4-methyl-21-azapentacyclo[12.7.0.02,7.08,13.015,20]henicosa-1(14),2(7),3,5,8,10,12,15(20),16,18-decaene .
user
C51H36N4
assistant