Using COc1cccc(-c2ccc3c(Sc4ccccc4)c(OC)ccc3c2)c1 to produce Oc1cccc(-c2ccc3c(Sc4ccccc4)c(O)ccc3c2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.