Using CCOC(=O)C(C)Oc1ccc2c(=O)c(-c3cccc(O)c3)coc2c1 to produce CC(Oc1ccc2c(=O)c(-c3cccc(O)c3)coc2c1)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.