Using Cc1c2n(c3ccc(Br)cc13)CCCC2=O, O=C1CCC(=O)N1Br to produce Cc1c2n(c3ccc(Br)cc13)CCC(Br)C2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.