Using CCOC=C(C(=O)OCC)C(=O)OCC, CCOC(=O)Cc1ccccn1 to produce CCOC(=O)c1cc(C(=O)OCC)c2ccccn2c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.