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