最佳答案
回答者：网友
O([H])C(C([H])([H])C([H])([H])[C@@]1(C([H])([H])[H])[C@]([H])(C(=C([H])[H])C([H])([H])[H])C([H])([H])C([H])([H])[C@]2(C([H])([H])[H])[C@]1([H])C([H])([H])C([H])=C1[C@]3([H])[C@@]([H])(C([H])([H])[H])[C@]([H])(C([H])([H])[H])C([H])([H])C([H])([H])[C@]3(C([H])([H])[H])C([H])([H])C([H])([H])[C@@]21C([H])([H])[H])=O
