Using CCC(CC)C(c1ccc(NC(=O)C2CCN(C(=O)OC(C)(C)C)CC2)cc1)n1ccnc1 to produce CCC(CC)C(c1ccc(NC(=O)C2CCNCC2)cc1)n1ccnc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.