Using COc1ccc2c(c1)S(=O)(=O)c1c(cc(OC)c(O)c1Br)N2 to produce COC1=CC2=Nc3ccc(OC)cc3S(=O)(=O)C2=C(Br)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.