Using COC(=O)c1cc2c(Oc3ccc4[nH]ccc4c3)ccnc2cc1OC to produce COc1cc2nccc(Oc3ccc4[nH]ccc4c3)c2cc1C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.