Using Cc1nc(NCc2ccccn2)nc(NC2CCN(C(=O)OC(C)(C)C)CC2)c1C to produce Cc1nc(NCc2ccccn2)nc(NC2CCNCC2)c1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.