You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(2-acetyl-3,4-dihydro-1H-isoquinolin-1-yl)-N-(4-bromo-2-chlorophenyl)acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H18BrClN2O2
assistant