Using Nc1nc2c(ncn2OC[C@H](CO)OCP(=O)(O)O)c(=O)[nH]1 to produce Nc1nc2c(ncn2OC[C@@H]2COP(=O)(O)CO2)c(=O)[nH]1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.