Using CNCc1cc(Br)n(S(=O)(=O)c2ccccc2)c1, O=C([O-])O to produce CN(Cc1cc(Br)n(S(=O)(=O)c2ccccc2)c1)C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.