Using COC(=O)c1cnc(OCC(F)(F)F)c(C)c1, O=C1CCC(=O)N1Br to produce COC(=O)c1cnc(OCC(F)(F)F)c(CBr)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.