You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name 3-chloro-N-[[(3S)-1-(4-methylphenyl)-5-oxopyrrolidin-3-yl]methyl]benzenesulfonamide ?
user
C18H19ClN2O3S
assistant