Using Nc1ncnc2c1nc(Br)n2[C@@H]1O[C@@H]2COP(=O)(O)O[C@H]2[C@H]1O to produce Nc1ncnc2c1ncn2[C@@H]1O[C@@H]2COP(=O)(O)O[C@H]2[C@H]1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.