You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 2-(4-chloro-3-fluorophenoxy)-N-[4-[4-(4-chloro-3-fluorophenyl)-2-oxopyrrolidin-1-yl]but-1-en-2-yl]acetamide .
user
C22H20Cl2F2N2O3
assistant