Using COc1ccc(-c2ccc(CC[C@@H](OC=O)[C@H](CCN3C(=O)c4ccccc4C3=O)C(=O)O)cc2)cn1 to produce COc1ccc(-c2ccc(CC[C@@H](O)[C@H](CCN3C(=O)c4ccccc4C3=O)C(=O)O)cc2)cn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.