You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 8-methyl-14,16-dioxa-8-azatetracyclo[9.7.0.02,7.013,17]octadeca-1(18),2(7),11,13(17)-tetraen-3-one by IUPAC nomenclature, provide its molecular formula.
user
C16H17NO3
assistant