You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-[3-[3-[3-(1,3-dimethylimidazol-1-ium-2-yl)sulfanylpropyl]imidazol-3-ium-1-yl]propylamino]-2-methylbenzo[de]isoquinoline-1,3-dione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H32N6O2S+2
assistant