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