Using CCOC(=O)C[C@H](O)[C@H](CC(C)C)NC(=O)[C@H](Cc1c[nH]cn1)NC(=O)[C@H](Cc1cccc2ccccc12)NC(=O)OCc1ccccc1 to produce CC(C)C[C@H](NC(=O)[C@H](Cc1c[nH]cn1)NC(=O)[C@H](Cc1cccc2ccccc12)NC(=O)OCc1ccccc1)[C@@H](O)CC(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.