Using CCOC(=O)C(C)C(=O)OCC, C=C1C(=O)C2CCN1CC2 to produce CCOC(=O)C(C)(CC1C(=O)C2CCN1CC2)C(=O)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.