[H]OC1=C([H])C2=C(O[C@]3(O[H])C([H])([H])[C@@]([H])(O[H])[C@@]2(C([H])([H])[H])C3(C([H])([H])[H])C([H])([H])[H])C([H])=C1C([H])([H])[H]