Using O=C1O[C@H]([C@@H](O)CO)C([O-])=C1O, O=C1O[C@H]([C@@H](O)CO)C(O)=C1O to produce O=C(O)C(=O)[C@@H](O)[C@H](O)[C@@H](O)CO, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.