Using CC(=O)Oc1c(Cl)cc(Cl)cc1C(=O)N[C@@H](Cc1ccccc1)C(=O)O to produce O=C(N[C@@H](Cc1ccccc1)C(=O)O)c1cc(Cl)cc(Cl)c1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.