Using CC(C)n1ncnc1-c1cn2c(n1)-c1cnc(O[C@@H](C)C(=O)OC(C)(C)C)cc1OCC2 to produce CC(C)n1ncnc1-c1cn2c(n1)-c1cnc(O[C@@H](C)C(=O)O)cc1OCC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.