Using O=C1CCC(=O)N1Br, Cc1c(Br)cc(Br)nc1-c1ccc(F)cc1Cl to produce Fc1ccc(-c2nc(Br)cc(Br)c2CBr)c(Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.