You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(5Z)-5-[[1-[(2-cyanophenyl)methyl]-2-methylindol-3-yl]methylidene]-2,4-dioxo-1,3-thiazolidin-3-yl]-N-(4-ethylphenyl)acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C31H26N4O3S
assistant