Using CCOC(=O)CC(=O)C(F)(F)F, COC(=O)Cc1ccc(N)cc1 to produce COC(=O)C=C(Nc1ccc(CC(=O)OC)cc1)C(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.