You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 5-methoxy-12-methyl-12,13,17-triazatetracyclo[8.7.0.02,7.011,15]heptadeca-1(17),2(7),3,5,8,10,15-heptaen-14-one by IUPAC nomenclature, provide its molecular formula.
user
C16H13N3O2
assistant