Using O=C1CCC(=O)N1Br, O=c1[nH]ccc2[nH]c3ccc(F)cc3c12 to produce O=c1[nH]cc(Br)c2[nH]c3ccc(F)cc3c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.