Using O=C1CC[C@@H](C(=O)O)N1, NC(=O)[C@@H]1CCCN1C(=O)[C@@H](N)Cc1cscn1 to produce NC(=O)[C@@H]1CCCN1C(=O)[C@H](Cc1cscn1)NC(=O)[C@@H]1CCC(=O)N1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.