[H]OC1=C([H])C(O[C@]2([H])O[C@]([H])(C([H])([H])O[H])[C@@]([H])(O[H])[C@]([H])(O[H])[C@@]2([H])O[H])=C(O[H])C(=C1[H])C([H])([H])N([H])C([H])([H])[H]