Using COc1ccc(C2(c3ccc(OC)c(OC)c3)CCC(=O)O2)cc1OC to produce Oc1ccc(-c2ccc(O)c3cc(O)c(O)cc23)cc1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.