Using CN1CCNCC1, CC(C)(C)OC(=O)N[C@@H](CNC(=O)c1ccc(Cl)s1)C(=O)O to produce CN1CCN(C(=O)[C@H](CNC(=O)c2ccc(Cl)s2)NC(=O)OC(C)(C)C)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.