Using COC(=O)c1cc(OC)c(OC)c(OC)c1-c1c(C(=O)OC)cc2c(c1OC)OCO2 to produce COc1cc(C(=O)O)c(-c2c(C(=O)O)cc3c(c2OC)OCO3)c(OC)c1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.