Using CN1CCC(N2CCN(C(=O)COCC3CCCCN3C(=O)OC(C)(C)C)CC2)CC1 to produce CN1CCC(N2CCN(C(=O)COCC3CCCCN3)CC2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.