You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(2,4-difluorophenyl)-3-azatricyclo[6.5.1.04,14]tetradeca-1,4,6,8(14)-tetraen-9-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H15F2NO
assistant