You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[2-[4-(3-chlorophenyl)-3-oxopiperazin-1-yl]-2-(2-methyl-1H-imidazol-5-yl)ethyl]benzonitrile The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H22ClN5O
assistant