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