Using CCCC[C@@H](CCO)Nc1nc(N)nc(C)c1C#CCNC(=O)OC(C)(C)C to produce CCCC[C@@H](CCO)Nc1nc(N)nc(C)c1CCCNC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.