You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2,3-dichlorophenyl)-[5-[4-(2-fluorophenyl)piperazine-1-carbonyl]pyrrolidin-3-yl]methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H22Cl2FN3O2
assistant