Using CC(C)(C)O, O=C(O)c1c(CS(=O)(=O)c2ccccc2)ccc(Br)c1O to produce CC(C)(C)OC(=O)c1c(CS(=O)(=O)c2ccccc2)ccc(Br)c1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.