Using COc1ccc2c(c1)C(C)(C)c1[nH]c3c(F)c(Cl)ccc3c1C2=O to produce CC1(C)c2cc(O)ccc2C(=O)c2c1[nH]c1c(F)c(Cl)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.