You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-[(2E)-2-[[3-[(E)-(3-ethyl-1,3-benzothiazol-2-ylidene)methyl]-2,4-dioxocyclobutyl]methylidene]-3,3-dimethyl-5-sulfoindol-1-yl]hexanoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C31H34N2O7S2
assistant