Using O=C1COC[C@@H]2C[C@H](Nc3ccc(Br)cc3[N+](=O)[O-])CN12 to produce O=[N+]([O-])c1cc(Br)ccc1N[C@H]1C[C@H]2COCCN2C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.