[H]OC1=C(C(O[C@]2([H])O[C@@]([H])(C([H])([H])[H])[C@]([H])(O[H])[C@@]([H])(O[H])[C@@]2([H])O[H])=C(C(=O)SC([H])([H])[H])C(=C1C([H])([H])[H])C([H])(C([H])([H])[H])C([H])([H])[H])C([H])([H])[H]