[H]O[C@]1([H])[C@@](O[H])(C(=O)C(C(=O)C1(C([H])([H])[H])C([H])([H])[H])(C([H])([H])[H])C([H])([H])[H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H]