Using CCOC(=O)C(=CNNc1c(Cl)cc(C(F)(F)F)cc1Cl)C(C)=O to produce CCOC(=O)c1cnn(-c2c(Cl)cc(C(F)(F)F)cc2Cl)c1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.