You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as 3-[2-[(Z)-2-[(Z)-(3-ethyl-5-methyl-1,3-benzothiazol-2-ylidene)methyl]but-1-enyl]-5,6-dimethyl-1,3-benzothiazol-3-ium-3-yl]propane-1-sulfonic acid using the IUPAC nomenclature.
user
C27H33N2O3S3+
assistant