[H]OC1=C(C(OC([H])([H])[H])=C([H])C(OC([H])([H])[H])=C1OC([H])([H])[H])C([H])([H])C([H])([H])C(=O)C1=C([H])C([H])=C([H])C([H])=C1[H]