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