Using COC(=O)[C@@H](N)CNC(=O)OC(C)(C)C, CCN(CCCl)CCCl to produce CCN1CCN([C@@H](CNC(=O)OC(C)(C)C)C(=O)OC)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.