You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 8,12,13,16,17-pentazatetracyclo[8.7.0.02,7.011,16]heptadeca-1(17),2,4,6,8,10,12,14-octaene into molecular formula.
user
C12H7N5
assistant