[H]O[C@]1([H])C(=C([H])[H])[C@@]2(C([H])([H])[H])[C@]3([H])[C@@]([H])(O[H])C(C([H])([H])[H])(C([H])([H])[H])C([H])([H])[C@]3([H])C([H])([H])[C@]22O[C@]12[H]