[H]O[C@]1([H])C([H])([H])C([H])([H])C2=C([H])[C@]3([H])OC([H])([H])[C@](O[H])(C([H])([H])[H])[C@]3([H])C([H])([H])[C@]2(C([H])([H])[H])[C@@]1([H])C([H])([H])[H]