Using CC(C)(C)OC(=O)NCC(=O)O, Oc1cc(Cl)c(Cl)cc1Cl to produce CC(C)(C)OC(=O)NCC(=O)Oc1cc(Cl)c(Cl)cc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.