Using O=C([O-])O, CC(C)C[C@@H](C=NNC(N)=O)NC(=O)[C@H](Cc1c[nH]cn1)NC(=O)C(CCCCc1ccccc1)Cc1cccc2ccccc12 to produce CC(C)C[C@@H](C=O)NC(=O)[C@H](Cc1c[nH]cn1)NC(=O)C(CCCCc1ccccc1)Cc1cccc2ccccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.