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 N-[(5-chloro-1-methylbenzimidazol-2-yl)methyl]-N-methyl-1-[4-(1,2,4-triazol-1-yl)phenyl]ethanamine ?
user
C20H21ClN6
assistant