You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[2-[2-[3-(1,3-benzothiazol-2-yl)-4-hydroxyphenyl]ethenyl]-3,3-dimethylindol-1-ium-1-yl]propane-1-sulfonic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C28H27N2O4S2+
assistant