Using O=C1CCC(=O)N1Br, O=c1cc(C(F)(F)F)c2c(O)cccc2[nH]1 to produce O=c1cc(C(F)(F)F)c2c(O)c(Br)ccc2[nH]1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.