You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
15-methyl-8-oxa-11-azatetracyclo[9.5.1.02,7.014,17]heptadeca-1(17),2,4,6-tetraen-16-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H17NO2
assistant