Using CCOC(=O)CC(=O)Cl, COC(=O)C1(CN)CN(C(=O)OC(C)(C)C)C1 to produce CCOC(=O)CC(=O)NCC1(C(=O)OC)CN(C(=O)OC(C)(C)C)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.