Using COc1ccc(S(=O)(=O)C2(Cc3ccccc3)SC(=O)NC2=O)cc1, CC(C)(C)OC(=O)CBr to produce COc1ccc(S(=O)(=O)C2(Cc3ccccc3)SC(=O)N(CC(=O)O)C2=O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.