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 2,5-diazapentacyclo[11.7.0.03,11.04,9.015,20]icosa-1,3(11),4(9),5,7,12,15,17,19-nonaene .
user
C18H12N2
assistant