Using CN(C(=O)OC(C)(C)C)[C@H](Cc1ccc(Cl)c(Cl)c1)C(=O)O, CC1(C)OC(=O)CC(=O)O1 to produce COC(=O)CC(=O)[C@@H](Cc1ccc(Cl)c(Cl)c1)N(C)C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.