Using CC(C)CC[C@H](O)[C@H](CC1CCCCC1)NC(=O)[C@@H](N)Cc1c[nH]cn1, O=C(O)[C@H](Cc1ccccc1)NC(=O)N1CCOCC1 to produce CC(C)CC[C@H](O)[C@H](CC1CCCCC1)NC(=O)[C@H](Cc1c[nH]cn1)NC(=O)[C@H](Cc1ccccc1)NC(=O)N1CCOCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.