You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name 1-[4-(1H-benzimidazol-2-yl)piperidin-1-yl]-2-[(6-chloropyridazin-3-yl)-methylamino]ethanone ?
user
C19H21ClN6O
assistant