[H]OC1=C2C(=O)C([H])([H])C([H])([H])[C@@]([H])(O[H])[C@@]2([H])C2(OC3=C([H])C([H])=C([H])C4=C([H])C([H])=C([H])C(O2)=C34)C([H])=C1[H]