Atomic structure

There are 2 chemically distinct structures. Please, select:

[*]O[C@@H]1[C@@H](O)[C@H](O[C@H]2[C@H](O)[C@@H](CO[C@@H]3O[C@H](CO)[C@H](O)[C@H](O)[C@H]3O)O[C@@H](O[C@@H]3[C@@H](NC(C)=O)[C@@H]([*])O[C@H](CO)[C@@H]3O)[C@@H]2O)O[C@H](CO)[C@@H]1O

SVG MW SMILES 3D mol Ionize

[*]O[C@@H]1[C@@H](O)[C@H](O[C@H]2[C@H](O)[C@@H](CO[C@@H]3O[C@H](CO)[C@H](O)[C@H](O)[C@H]3O)O[C@@H](O[C@@H]3[C@@H](NC(C)=O)[C@@H]([*])O[C@H](CO)[C@@H]3O)[C@@H]2O)O[C@H](CO)[C@@H]1O

689.617 g/mol (C₂₆H₄₃R₂NO₂₀, R = next and previous repeats, not counted in mol weight)