You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 2-(4-bromophenyl)-N-[(1S)-8,9-difluoro-6-oxo-1,2,4,5-tetrahydropyrano[3,4-c]isoquinolin-1-yl]-2,2-difluoro-N-methylacetamide .
user
C21H15BrF4N2O3
assistant