Atomic structure
There are 2 chemically distinct structures. Please, select:

O=C(O)[C@@]1(O)C[C@@H](O[C@]2(C(=O)O)C[C@@H](O)[C@@H](O)[C@@H]([C@H](O)CO)O2)[C@@H](O)[C@@H]([C@H](O)CO[C@]2(C(=O)O)C[C@@H](O)[C@@H](O)[C@@H]([C@H](O)CO)O2)O1