You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 9-(2,5-dimethylphenyl)-8,13,14,16-tetrazatetracyclo[8.6.1.02,7.013,17]heptadeca-1(16),2,4,6,8,10(17),11,14-octaene .
user
C21H16N4
assistant