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-(3-chlorobenzoyl)piperazin-1-yl]-N-[3-chloro-4-(difluoromethoxy)phenyl]acetamide .
user
C20H19Cl2F2N3O3
assistant