Using COC(=O)c1cc(N(CCBr)CCBr)c(S(C)(=O)=O)cc1[N+](=O)[O-] to produce CS(=O)(=O)c1cc([N+](=O)[O-])c(C(=O)O)cc1N(CCBr)CCBr, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.