You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 4-(3,4-dimethoxyphenyl)-2-[[3-(1,3-dioxoisoindol-2-yl)benzoyl]amino]-5-methylthiophene-3-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C31H26N2O7S
assistant