Using CC(C)(C)NC(=O)[C@@H]1CCCN1C(=O)[C@@H](O)[C@H](Cc1ccccc1)NC(=O)[C@H](CC(N)=O)NC(=O)COc1ccc(NC(=O)OCc2ccccc2)cc1 to produce CC(C)(C)NC(=O)[C@@H]1CCCN1C(=O)[C@@H](O)[C@H](Cc1ccccc1)NC(=O)[C@H](CC(N)=O)NC(=O)COc1ccc(N)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.