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