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