[H]OC1=C([H])C(O[H])=C(C2=C(O[H])C([H])=C(O[H])C3=C2C(=O)C2=C([H])C(=C([H])C(O[H])=C2C3=O)C([H])([H])[H])C2=C1C(=O)C1=C(O[H])C([H])=C(C([H])=C1C2=O)C([H])([H])[H]