Using COc1ccc(C2(C)Cc3cc(OCc4ccccc4)c(Cl)c(Cl)c3C2=O)cc1 to produce COc1ccc(C2(C)Cc3cc(O)c(Cl)c(Cl)c3C2=O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.