[H]N1C2=C([H])C([H])=C([H])C([H])=C2[C@]2(C1=O)C([H])([H])[C@]13N([H])C(=O)[C@]4(N(C1=O)C([H])([H])C([H])([H])C4([H])[H])C([H])([H])[C@]3([H])C2(C([H])([H])[H])C([H])([H])[H]