Using COC(=O)c1cccn([C@@H](Cc2cn(C(=O)OC(C)(C)C)c3ccccc23)C(=O)OC(C)(C)C)c1=O to produce CC(C)(C)OC(=O)[C@H](Cc1cn(C(=O)OC(C)(C)C)c2ccccc12)n1cccc(C(=O)O)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.