You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as 9,10-dimethoxy-2,3-di(propan-2-yloxy)-5,6-dihydroisoquinolino[2,1-b]isoquinolin-7-ium using the IUPAC nomenclature.
user
C25H30NO4+
assistant