Using C=C[C@@H](C[C@H](O)[C@@H](NC(=O)[C@H](Cc1c[nH]cn1)NC(=O)C(Cc1ccccc1)C(=O)NOCc1ccccc1)C1CCCCC1)C(C)C to produce CC[C@@H](C[C@H](O)[C@H](CC1CCCCC1)NC(=O)[C@H](Cc1c[nH]cn1)NC(=O)C(Cc1ccccc1)C(=O)NO)C(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.