You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(4-chlorophenyl)-1-[[4-(1,1-dioxothiolan-3-yl)piperazin-1-yl]methyl]-4-methylimidazol-2-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H25ClN4O3S
assistant