Using COc1cc(C)c(C(C)c2ccc(OC)c(C(C)C)c2)c(C)c1 to produce Cc1cc(O)cc(C)c1C(C)c1ccc(O)c(C(C)C)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.