Using NOS(=O)(=O)O, O=c1[nH]c2cc(Br)cc(Br)c2[nH]c1=O to produce Nn1c(=O)c(=O)[nH]c2c(Br)cc(Br)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.