You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance [2-[(4-chlorophenyl)methyl-methylamino]-2-oxoethyl] 1-thiophen-2-ylsulfonylpiperidine-4-carboxylate .
user
C20H23ClN2O5S2
assistant