Using O=C(CCC(F)(F)F)c1ccc(-c2ccc(Cl)cc2)cn1, CON to produce CON=C(CCC(F)(F)F)c1ccc(-c2ccc(Cl)cc2)cn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.