Using O=[N+]([O-])c1cc(Br)cc2c1-c1ccc(Br)cc1CC2 to produce Brc1cc2c3c(c1)[nH]c1cc(Br)cc(c13)CC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.