Using O=C([O-])O, COC(OC)(c1ccc(CC(C)C)cc1)C(C)OS(C)(=O)=O to produce CC(C)Cc1ccc(C(C)C(=O)O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.