Using CCOC(=O)c1c(O)c2cc(-c3ccc(-c4cccc(OC)c4O)cc3)c(Cl)cc2[nH]c1=O to produce COc1cccc(-c2ccc(-c3cc4c(O)c(C(=O)O)c(=O)[nH]c4cc3Cl)cc2)c1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.