Using Cc1cnc(N2CCN(C(=O)c3ccc(N4CN(C(=O)OC(C)(C)C)CC4=O)cc3)CC2)c(C)c1 to produce Cc1cnc(N2CCN(C(=O)c3ccc(N4CNCC4=O)cc3)CC2)c(C)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.