Using COC(=O)c1coc2cc(Oc3ccnc4cc(OC)c(OC)cc34)ccc12 to produce COc1cc2nccc(Oc3ccc4c(C(=O)O)coc4c3)c2cc1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.