Using CC(C)c1cccc(C(C)C)c1O, O=C1OC(=O)c2ccccc21 to produce CC(C)c1cccc(C(C)C)c1OC(=O)c1ccccc1C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.