[H]O[C@@]1([H])C2=C(O[C@@]([H])(C(\[H])=C(\[H])[C@]([H])(C([H])([H])[H])C([H])([H])[C@@](O[H])(C([H])([H])[H])C([H])([H])C([H])([H])[H])[C@]1([H])O[H])[C@@]([H])(OC2=O)C([H])([H])[H]