Using CCOC(=O)C(C)(C)c1ccc(-c2cccc(COC)c2)c(OC)c1 to produce COCc1cccc(-c2ccc(C(C)(C)C(=O)O)cc2OC)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.