Using COC(=O)[C@H](CC=O)NC(=O)OC(C)(C)C, O=C([O-])C(F)(F)Cl to produce COC(=O)[C@H](CC=C(F)F)NC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.