You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 1-(4-acetyl-3,5-dimethyl-1H-pyrrol-2-yl)-2-[4-(3-chlorophenyl)piperazin-1-yl]ethanone .
user
C20H24ClN3O2
assistant