Using CCc1nc2c(N)nc3cccnc3c2n1CC1(O)CCN(C(=O)OC(C)(C)C)CC1 to produce CCc1nc2c(N)nc3cccnc3c2n1CC1(O)CCNCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.