Using CCOC(=O)C(C)(Cc1ccc(Br)cc1)S(=O)(=O)c1ccc(OC)cc1 to produce COc1ccc(S(=O)(=O)C(C)(Cc2ccc(Br)cc2)C(=O)O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.