You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3S)-N-[(3R)-3-methyl-1,1-dioxothiolan-3-yl]-5-oxo-1-(2-phenylethyl)pyrrolidine-3-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H24N2O4S
assistant