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