Using CC(C)(C)OC(=O)N(C(=O)OC(C)(C)C)C(CN1CCC(O)CC1)C(=O)N1CCC(N2CCCCC2)CC1 to produce CC(C)(C)OC(=O)NC(CN1CCC(=O)CC1)C(=O)N1CCC(N2CCCCC2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.