You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(4-chlorophenyl)methyl]-N-methyl-2-[4-(2-methylphenyl)piperazin-1-ium-1-yl]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H27ClN3O+
assistant