Using C[O-], Nc1ncnc2c1nc(Br)n2[C@H]1C[C@H](O)[C@@H](CO)O1 to produce COc1nc2c(N)ncnc2n1[C@H]1C[C@H](O)[C@@H](CO)O1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.