You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(1R)-1-(2,4-dichlorophenyl)ethyl]-2-[(2R)-2,4-dimethylpiperazin-1-yl]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H23Cl2N3O
assistant