Using O=C1c2ccccc2-c2nccc3c(Br)cnc1c23, [N-]=[N+]=[N-] to produce Nc1cnc2c3c(nccc13)-c1ccccc1C2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.