You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as 1-[4-[5-chloro-4-(1-methylbenzimidazol-2-yl)pyridin-2-yl]piperazin-1-yl]ethanone using the IUPAC nomenclature.
user
C19H20ClN5O
assistant