You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(E)-1-[4-(4-chlorobenzoyl)piperazin-1-yl]-3-(2,5-dimethoxyphenyl)prop-2-en-1-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H23ClN2O4
assistant