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 9-methyl-4-phenyl-1,4-diazatetracyclo[7.6.1.05,16.010,15]hexadeca-5(16),6,10,12,14-pentaene-2,3-dione ?
user
C21H16N2O2
assistant