[H]O[C@@]12C([H])=C(C([H])([H])[H])[C@]3([H])C([H])([H])C(C([H])([H])[H])(C([H])([H])[H])C([H])([H])[C@@]13[C@@](O[H])(C([H])([H])[H])C([H])([H])C2([H])[H]