Atomic structure
There is only one chemically distinct structure:
O=C(O)[C@H]1O[C@H](O[C@@H]2[C@H](O)[C@H](O[C@@H]3[C@@H](CO)O[C@H](O)[C@H](O)[C@H]3O)O[C@H](CO)[C@H]2O[C@@H]2O[C@H](CO)[C@@H](O)[C@H](O)[C@H]2O)[C@H](O)[C@@H](O)[C@@H]1O