[H]OC1=C2C(=O)OC(=C([H])C2=C([H])C2=C1[C@]1(O[H])C(O[H])=C3C(=O)C4=C(C(=O)C([H])=C(OC([H])([H])[H])C4=O)C(=O)C3=C(O[H])[C@]1(O[H])C([H])([H])C2([H])[H])C([H])([H])[H]