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 methyl (4Z)-1-(4-chlorophenyl)-4-[(3,4-dichlorophenyl)methylidene]-2-methyl-5-oxopyrrole-3-carboxylate .
user
C20H14Cl3NO3
assistant