Atomic structure
There is only one chemically distinct structure:
CC(=O)N[C@H]1[C@@H](O[C@H](C)[C@H](N)C(=O)O)O[C@H](CO[C@]2(C(=O)O)C[C@H](O)[C@@H](NC(C)=O)[C@H]([C@H](O)[C@H](O)CO)O2)[C@H](O)[C@@H]1O