Using C=C(NC(C)=O)C(=O)OC, FC(F)(F)c1cc(Br)cc(C(F)(F)F)c1 to produce COC(=O)C(=Cc1cc(C(F)(F)F)cc(C(F)(F)F)c1)NC(C)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.