You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(3-chloro-4-fluorophenyl)-1-[(1R)-1-(8-chloro-1-oxo-2H-isoquinolin-4-yl)ethyl]-1-methylurea The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H16Cl2FN3O2
assistant