Using Oc1ccc(Cc2ncc(C(F)(F)F)cc2Cl)c(Cl)c1Cl, COC(=O)CBr to produce COC(=O)COc1ccc(Cc2ncc(C(F)(F)F)cc2Cl)c(Cl)c1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.