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 [1-(cyclopentylamino)-1-oxopropan-2-yl] 1-(3-methylsulfanylphenyl)-5-oxopyrrolidine-3-carboxylate .
user
C20H26N2O4S
assistant