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