You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-(4-ethoxy-2-nitroanilino)-2-oxoethyl] 1-(4-chlorophenyl)sulfonylpyrrolidine-2-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H22ClN3O8S
assistant