Using COC(=O)c1ccc2c(=O)n(Cc3ccc(Cl)cc3Cl)c(=O)n(C)c2c1 to produce Cn1c(=O)n(Cc2ccc(Cl)cc2Cl)c(=O)c2ccc(C(=O)O)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.