Using COCCOc1nc(N)c2nc(OC)n(Cc3ccc(C=O)cc3)c2n1 to produce COCCOc1nc(N)c2nc(O)n(Cc3ccc(C=O)cc3)c2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.