Using COc1cc2c3cc(OC)c(OC)cc3c3cc(OC)c(OC)cc3c2cc1OC to produce Oc1cc2c3cc(O)c(O)cc3c3cc(O)c(O)cc3c2cc1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.