Atomic structure
There is only one chemically distinct structure:
CC(=O)N[C@@H]1[C@@H](O)C[C@](O)(C(=O)O)O[C@H]1[C@H](O)[C@@H](CO)O[C@]1(C(=O)O)C[C@H](O)[C@@H](NC(C)=O)[C@H]([C@H](O)[C@H](O)CO)O1