[H]OC1=C2C(=O)OC3=C(O[C@@]4(OC5=C([H])C([H])=C([H])C(=C5C4=O)C([H])([H])[H])C([H])([H])[H])C(OC([H])([H])[H])=C([H])C(=C3C2=C([H])C(OC([H])([H])[H])=C1[H])C([H])([H])[H]