[H]O[C@]1([H])C(=O)C2=C3C(=O)C4=C(C(=O)C3=C([H])C([H])=C2[C@]([H])(O[H])[C@]1([H])C([H])([H])[H])C(OC([H])([H])[H])=C([H])C([H])=C4[H]