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 4-cyano-N-[4-(2,4,5,13,15-pentazatetracyclo[12.4.0.02,6.07,12]octadeca-1(14),3,5,7,9,11,15,17-octaen-3-yl)phenyl]benzamide ?
user
C27H17N7O
assistant