You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 3,19-dimethyl-6,12-diaza-3,19-diazonia-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2,4,6,9(21),10,12,15(20),16,18-nonaene ?
user
C18H17BN4+2
assistant