Using O=C1NC(=O)c2c1cccc2[N+](=O)[O-], CC(C)(C)OC(=O)CBr to produce CC(C)(C)OC(=O)CN1C(=O)c2cccc([N+](=O)[O-])c2C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.