You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(3-chloro-4-fluorophenyl)-N-(1-hydroxy-4-methylsulfanylbutan-2-yl)-5-oxopyrrolidine-3-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H20ClFN2O3S
assistant