Using O=C(O)c1cccc2c1C(=O)c1ccccc1-2, CCOC(=O)CNC(=O)C(O)[C@H](COCc1ccccc1)NC(=O)[C@@H](N)CC(C)C to produce CCOC(=O)CNC(=O)C(O)C(COCc1ccccc1)NC(=O)[C@@H](CC(C)C)NC(=O)c1cccc2c1C(=O)c1ccccc1-2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.