Using Cc1[nH]c2c(Br)ccc([N+](=O)[O-])c2c1Oc1ccc(Cl)cc1, CC(C)(C)OC(=O)CBr to produce Cc1c(Oc2ccc(Cl)cc2)c2c([N+](=O)[O-])ccc(Br)c2n1CC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.