Using CC(C)(C)OC(=O)N[C@H](CO)C(=O)O, ClCc1cc(Cl)cc(Cl)c1 to produce CC(C)(C)OC(=O)NC(COCc1cc(Cl)cc(Cl)c1)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.