Using O=C(Cl)CCl, COC(=O)[C@H]1CC[C@H](NCCNC(=O)OC(C)(C)C)CC1 to produce COC(=O)[C@H]1CC[C@H](N(CCNC(=O)OC(C)(C)C)C(=O)CCl)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.