[H]OC(=O)C([H])([H])C([H])([H])C([H])([H])C(\[H])=C(\[H])C([H])([H])C(\[H])=C(\[H])C([H])([H])C(\[H])=C(\[H])/C(/[H])=C(\[H])C(O)C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H]