Using CCC(CC)(c1ccc(O)c(C)c1)c1cc2ccc(C(=O)O)cc2s1, O=C([O-])O to produce CCC(CC)(c1ccc(O)c(C)c1)c1cc2ccc(C(=O)OC)cc2s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.