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 identified by (13S)-2,10,20-triazapentacyclo[11.7.1.03,8.09,21.014,19]henicosa-1,3,5,7,9(21),14,16,18-octaene ?
user
C18H15N3
assistant