You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 1-[(2-chlorophenyl)methyl]-N-[[4-(methylsulfamoylmethyl)phenyl]methyl]-5-oxopyrrolidine-3-carboxamide into molecular formula.
user
C21H24ClN3O4S
assistant