[H]OC1=C([H])C([H])=C(C([H])=C1O[H])C1=C([H])C(=O)C2=C3O[C@]4(C([H])([H])[H])C([H])([H])C([H])([H])C([H])([H])C(C([H])([H])[H])(C([H])([H])[H])[C@]4([H])C([H])([H])C3=C(OC([H])([H])[H])C([H])=C2O1