You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-methyl-11,17-diazatetracyclo[11.3.1.02,11.03,8]heptadeca-3(8),4,6-trien-12-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H20N2O
assistant