Using CCOCc1nc2c(N)nc3cc(-c4cncc(CO)c4)cnc3c2n1CC(C)(C)O to produce CC(C)(O)Cn1c(CO)nc2c(N)nc3cc(-c4cncc(CO)c4)cnc3c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.