Atomic structure

There are 2 chemically distinct structures. Please, select:

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

SVG MW SMILES 3D mol Ionize

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

495.478 g/mol (C₂₀H₃₃R₂NO₁₃, R = next and previous repeats, not counted in mol weight)