You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[4-[6-(2-chloro-5-methylphenoxy)pyrimidin-4-yl]piperazin-1-yl]-2-ethylhexan-1-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H31ClN4O2
assistant