Using CCOCC, CC1(C)CCC(C)(C)c2cc(C3(C)COc4ccc(C=CC(=O)O)cc43)ccc21 to produce CC(=O)c1ccc2c(c1)C(C)(c1ccc3c(c1)C(C)(C)CCC3(C)C)CO2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.