Using CCOC(=O)COc1c(-c2ccc3c(c2)COC3=O)ccc(OC)c1OCC1CC1 to produce COc1ccc(-c2ccc3c(c2)COC3=O)c(OCC(=O)O)c1OCC1CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.