You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl (3E)-1-(4-chlorophenyl)sulfonyl-3-(dimethylaminomethylidene)-4-oxopiperidine-2-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H21ClN2O5S
assistant