You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1,1,3-trimethyl-2-[3-(1,1,3-trimethyl-8-sulfobenzo[e]indol-2-ylidene)prop-1-enyl]benzo[e]indol-3-ium-6,8-disulfonic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C33H33N2O9S3+
assistant