Using O=c1c2ccc(Br)cc2nc2n1CC(OS(=O)(=O)c1ccc(Br)cc1)CC2 to produce O=c1c2ccc(Br)cc2nc2n1CC1CC21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.