You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 3-[5-[2,6-bis(2-sulfoethylcarbamoyl)pyridin-4-yl]-2-ethenyl-3,3-dimethylindol-1-ium-1-yl]propane-1-sulfonic acid into molecular formula.
user
C26H33N4O11S3+
assistant