You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by 1-(3-chlorophenyl)-N-[[3-fluoro-4-(2-methylimidazol-1-yl)phenyl]methyl]-5-oxopyrrolidine-3-carboxamide ?
user
C22H20ClFN4O2
assistant