Using O=C1CCC(=O)N1Br, CC(C)(C)OC(=O)N1CCC(Oc2ccc3cnc(Cl)cc3c2)CC1 to produce CC(C)(C)OC(=O)N1CCC(Oc2ccc3cnc(Cl)cc3c2Br)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.