Using O=C1CC(=O)N(c2ccc(NS(=O)(=O)c3cccc(Br)c3)cc2)c2ccc3ccccc3c2N1, O=C([O-])[O-] to produce CN(c1ccc(N2C(=O)CC(=O)Nc3c2ccc2ccccc32)cc1)S(=O)(=O)c1cccc(Br)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.