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