Using CCOC(=O)c1cccc(-c2cccc3c2C(=O)OC(C)(C)O3)c1 to produce COC(=O)c1cccc(-c2cccc(O)c2C(=O)OC)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.