[H]OC1=C([H])C2=C(C3=C1[C@@](C([H])([H])[H])([C@]([H])(O[H])C([H])([H])C([H])=C(C([H])([H])[H])C([H])([H])[H])[C@]([H])(O3)C([H])([H])[H])C(=O)C(=C(OC([H])([H])[H])C2=O)C([H])([H])[H]