You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
16-oxa-18-azatetracyclo[8.8.0.02,7.012,17]octadeca-1(18),2,4,6,8,10,12(17),13-octaene The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H11NO
assistant