You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[2-[4-[(2-chloro-6-fluorophenyl)methyl]piperazin-1-yl]-2-oxoethyl]-methylamino]-N-(4-methylphenyl)acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H28ClFN4O2
assistant