Using O=C1CCC(=O)N1Br, COP(=O)(Cc1cc2cc(Cl)ccc2nc1C)OC to produce COP(=O)(Cc1cc2cc(Cl)ccc2nc1CBr)OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.