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