Using O=C(Cl)CCl, CC(C)(C)OC(=O)N1CCC(=Cc2cc(Br)cc([N+](=O)[O-])c2O)CC1 to produce CC(C)(C)OC(=O)N1CCC(Cc2cccc3c2OCC(=O)N3)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.