You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 3-(3-chloro-4-fluorophenyl)-1-[(1S)-1-(6,8-difluoro-1-oxo-2H-isoquinolin-4-yl)ethyl]-1-(2-sulfamoylethyl)urea .
user
C20H18ClF3N4O4S
assistant