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 6-[(3,4-dichlorophenyl)methyl]-2-methyl-4,17-dioxa-6-azoniatetracyclo[8.7.0.03,8.011,15]heptadeca-1(10),2,8,11(15)-tetraen-16-one .
user
C22H20Cl2NO3+
assistant