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 (2R)-N-(2,4-dichlorophenyl)-2-(6,7-dimethoxy-1,2,3,4-tetrahydroisoquinolin-2-ium-2-yl)propanamide .
user
C20H23Cl2N2O3+
assistant