You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[[4-[(2-bromophenyl)methyl]piperazine-1,4-diium-1-yl]methyl]-2,6-dimethoxyphenol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H27BrN2O3+2
assistant