Using O=C(NS(=O)(=O)c1ccc([N+](=O)[O-])cc1)c1cc(Br)c(OCc2cccc(Br)c2)c(Br)c1 to produce Nc1ccc(S(=O)(=O)NC(=O)c2cc(Br)c(OCc3cccc(Br)c3)c(Br)c2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.