Using COc1ccc2c(c1)C(C)(C)c1[nH]c3cc(Cl)c(C)cc3c1C2=O to produce Cc1cc2c3c([nH]c2cc1Cl)C(C)(C)c1cc(O)ccc1C3=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.