[H]O[C@]1([H])C([H])([H])[C@@]2([H])[C@@]([H])(C([H])([H])C([H])([H])C3=C([H])C(=O)C([H])([H])C([H])([H])[C@]23C([H])([H])[H])[C@]2([H])C([H])([H])[C@]3([H])O[C@@]4(OC([H])([H])[C@]([H])(C([H])([H])[H])C([H])([H])C4([H])[H])[C@@]([H])(C([H])([H])[H])[C@]3(O[H])[C@@]12C([H])([H])[H]