You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 4-(ethoxycarbonylcarbamoyl)-5-[(2-ethylsulfonylbenzoyl)amino]-3-methylthiophene-2-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H24N2O8S2
assistant