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 N-[2-[4-chloro-2-(2-chlorobenzoyl)-N-methylanilino]-2-oxoethyl]-2-(propan-2-ylamino)acetamide .
user
C21H23Cl2N3O3
assistant