Using CC(C)(C)OC(=O)N1CCC(C)(C(=O)O)C1, CCN(C(C)C)C(C)C to produce CC(C)(C)OC(=O)N1CCC(C)(C(=O)N2CCCC2)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.