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 4-chloro-N-[(3R,4R)-4-[(4-chlorobenzoyl)amino]-3,4-dimethyl-2,5-dioxopyrrolidin-3-yl]benzamide .
user
C20H17Cl2N3O4
assistant