You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (3,5-dichlorophenyl)-[4-(4-fluorophenyl)-1-(1-methylimidazol-4-yl)sulfonylpyrrolidin-3-yl]methanone .
user
C21H18Cl2FN3O3S
assistant