You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (2Z)-2-[(E)-4-oxidooxy-4-(1,3,3-trimethylindol-1-ium-2-yl)but-2-enylidene]-1,1-dioxo-1-benzothiophen-3-one ?
user
C23H21NO5S
assistant