You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule 18-(4,6-diphenyl-1,3,5-triazin-2-yl)-21-phenyl-10,14-dioxa-21lambda5-phosphapentacyclo[11.8.0.03,11.04,9.015,20]henicosa-1(13),2,4,6,8,11,15(20),16,18-nonaene 21-oxide ?
user
C39H24N3O3P
assistant