Using O=C(O)CCCCC(=O)O, Nc1nc2c(ncn2[C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=O)[nH]1 to produce Nc1nc2c(ncn2[C@]2(C(=O)CCCCC(=O)O)O[C@H](CO)[C@@H](O)[C@H]2O)c(=O)[nH]1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.