Atomic structure
There is only one chemically distinct structure:
[1*]O[C@@H]1[C@@H](CO)OC(NC(=O)C[C@H](N)C(=O)O)[C@H](NC(C)=O)[C@H]1O[C@@H]1O[C@@H](C)[C@@H](O)[C@@H](O)[C@@H]1OR1 = SUG