Using COC(=O)c1cc(OC)cc(OC)c1-c1c(OC)cc(OC)cc1C(=O)OC to produce COc1cc(CO)c(-c2c(CO)cc(OC)cc2OC)c(OC)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.