Using CCON, CC(=O)C1C(=O)CC(C(C)CSc2ccc(C(F)(F)F)cc2)CC1=O to produce CCONC(C)=C1C(=O)CC(C(C)CSc2ccc(C(F)(F)F)cc2)CC1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.