Using CCOC(=O)c1cc2c(=O)c3cc(C(C)=O)ccc3oc2nc1N to produce CC(=O)c1ccc2oc3nc(N)c(C(=O)O)cc3c(=O)c2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.