Using CN(C)C=O, CC(C)(C)OC(=O)N1CC=C(CC(C(=O)O)C(=O)O)C1 to produce COC(=O)CCC1=CCN(C(=O)OC(C)(C)C)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.