Using O=C1CCC(=O)N1Br, O=C(c1ccccc1)c1cccc(CBr)c1CBr to produce O=C(c1ccccc1)c1cccc(C(Br)Br)c1CBr, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.