Using CC(=O)OC(C)=O, CC(C)(C)OC(=O)N1CC[C@@H](O)[C@H]1C(=O)O to produce CC(=O)O[C@@H]1CCN(C(=O)OC(C)(C)C)[C@@H]1C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.