Using C1CNC1, COC(=O)C1CN(C(=O)OC(C)(C)C)CCC1=O to produce COC(=O)C1CN(C(=O)OC(C)(C)C)CCC1N1CCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.