You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-[2-[4-(2-chlorophenyl)sulfonylpiperazin-1-yl]-2-oxoethyl]-3-propylbenzimidazol-2-one into its molecular formula.
user
C22H25ClN4O4S
assistant