Using COc1c(-c2ccccc2)cccc1C(O)c1cccc(C(C)(C)C)c1OCc1ccccc1 to produce COc1c(C(=O)c2cccc(C(C)(C)C)c2OCc2ccccc2)cccc1-c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.