You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-[4-(3-chlorophenyl)piperazin-1-yl]-4,5-dihydroimidazol-1-yl]-(3,5-dimethoxyphenyl)methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H25ClN4O3
assistant