You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 12-methyl-14-oxa-2-azatetracyclo[13.4.0.02,7.08,13]nonadeca-1(19),8,10,12,15,17-hexaen-5-one .
user
C18H17NO2
assistant