You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(1S)-8,9-difluoro-6-oxo-1,2,4,5-tetrahydropyrano[3,4-c]isoquinolin-1-yl]-3-(3-fluorophenoxy)-N-methylbenzamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H19F3N2O4
assistant