[H]O[C@]12C(=C([H])C([H])([H])[C@@]3([H])C(=C([H])[H])C(=O)O[C@]3([H])[C@@]1([H])[C@@]1(O[C@]1([H])C2([H])[H])C([H])([H])[H])C([H])([H])[H]