Using O=[N+]([O-])c1cc[nH]n1, CCCC(Br)c1ccc(C(=O)OC)cc1 to produce CCCC(c1ccc(C(=O)OC)cc1)n1ccc([N+](=O)[O-])n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.