Using O=c1[nH]c2cccc([N+](=O)[O-])c2[nH]1, CC(C)(C)OC(=O)CBr to produce CC(C)(C)OC(=O)Cn1c(=O)[nH]c2c([N+](=O)[O-])cccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.