You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[2-(5-chloro-1H-indazol-3-yl)-3H-benzimidazol-5-yl]-N,N-dimethylpiperidin-4-amine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H23ClN6
assistant