Using COc1ccc(-c2ccc(CC[C@H]3O[C@@H](O)[C@@H](O)[C@H]3CCN3C(=O)c4ccccc4C3=O)cc2)cn1 to produce COc1ccc(-c2ccc(CC[C@@H](OC=O)[C@@H](C=O)CCN3C(=O)c4ccccc4C3=O)cc2)cn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.