Atomic structure
There is only one chemically distinct structure:
O=C(CO)N[C@@H]1[C@@H](O)C[C@](OC[C@H]2O[C@@H](O[C@@H]3[C@@H](CO)OC(O)[C@H](O)[C@H]3O)[C@H](O)[C@@H](O)[C@H]2O)(C(=O)O)O[C@H]1[C@H](O)[C@H](O)CO