You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 3-[6-(2,5-dimethoxyphenyl)-2-[(1-ethyl-6-methylquinolin-1-ium-2-yl)methylidene]-1,3-benzothiazol-3-yl]propanoic acid into its molecular formula.
user
C31H31N2O4S+
assistant