You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as (2Z,9Z)-6,20-diazatetracyclo[9.6.2.14,8.012,17]icosa-1(18),2,4,6,8(20),9,11(19),12,14,16-decaene using the IUPAC nomenclature.
user
C18H12N2
assistant