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 3,5-dichloro-N-[3-(6,7-dimethoxy-3,4-dihydro-1H-isoquinolin-2-yl)propyl]benzenesulfonamide .
user
C20H24Cl2N2O4S
assistant