Using CSc1ccc(NS(C)(=O)=O)cc1, CC(C)(C)OC(=O)CBr to produce CSc1ccc(N(CC(=O)OC(C)(C)C)S(C)(=O)=O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.