Using Br, NC(=O)c1[nH]c2c(N)cccc2c1S(=O)(=O)N1CCOCC1 to produce NC(=O)c1[nH]c2c(Br)cccc2c1S(=O)(=O)N1CCOCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.